Qiitaタグの記事数とフォロワー数を比較してみた

Qiita初投稿です。

とある目的で、Qiitaの上位タグ名一覧(ランキング順)を使用するために、Qiita APIで取得したタグの記事数とフォロワー数を見ていたら、下記が気になって試した結果を記載します。
※本記事中のタグの記事数とフォロワー数は2019/5/19のものです。

 - タグフィードのランキングは「記事数」のようだけど、「フォロワー数」と(数値が)どう違うのか
 - 記事数順位35位の「#migrated」って？
 - QiitaってCodePenとチャート系のCDN.使ってお手軽にグラフとかって見せれるかな？

# タグのデータ取得

本格的な分析がしたいわけではないので、お手軽重視ということで、タグ一覧 ([公式ドキュメント](https://qiita.com/api/v2/docs#%E3%82%BF%E3%82%B0))のみを使用する方針で、node.jsでデータを取得し.jsonファイルとして保存。

<details><summary>使い捨てコード(node.js)</summary><div>

``` javascript
let request = require('request');

let headers = {
    'Authorization': 'Bearer 1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcd' // token
};

let cnt = 1;
let tags = [];

function execRequest() {
  let options = {
    url: 'https://qiita.com/api/v2/tags?page=' + cnt + '&per_page=100&sort=count',
    headers: headers
  }
  request(options, function(error, response, body) {
    if (error) {
        return console.error('ERROR!', error);
    } else {
        let tmp = JSON.parse(body);
        tags = tags.concat(tmp);
        if (tmp.length == 100 && cnt < 100) {
          cnt += 1;
          setTimeout(execRequest, 1000);
        } else {
          fs.writeFile('tags.json', JSON.stringify(tags) , (err, data) => {});
        }
    }
  });
}

execRequest();
```

</div></details>

~~1ページ数が最大100で、ページの最大が100なので、本APIのみでは最大10,000件しか取得できず、またフォロワー数のソートもできないため使いにくい。せめてタグ一覧の最大ページは1000くらいまで上げてもらえないだろうか。~~
タグ一覧のページングからは46,494件のタグが存在するようだが、タグ一覧取得APIでは記事数順の上位10,000件しか扱えないため、今回は10,000件のみを対象とする

# 結果に評価値を付与して上位一覧出力

下記の処理をして、CSV形式とchart.js用の形式でデータ出力

- 取得結果のフィルタ(ページングで中途半端な取得となっているため、全件ではなく、記事数/フォロワー数が一定数以上を処理対象とする)
- 各タグの記事数/フォロワー数を合計で正規化(割合算出)し、評価値は記事数/フォロワー数を同じ重みづけで合計
- 参考までにフォロワー数(正規化後)と記事数(正規化後)の差異を算出

<details><summary>使い捨てコード(node.js)</summary><div>

``` javascript
// tags.jsonにデータが配置している前提
const OUTPUT_RANKING_NUM = 300;
const CHART_SCORE = 0.18;
const OUTPUT_VARS = [
  { min_item_count:   7, min_followers_count:   0 },
  { min_item_count:  20, min_followers_count:  20 },
];
const WEIGHT = { item_count: 1, followers_count: 1};

let fs = require("fs");

const set_rank = (arr, attr, sort_flg) => {
  let target = sort_flg ? arr : arr.slice();
  target.sort( (a, b) => b[attr] - a[attr] );
  let tmp_ranking = 0;
  let tmp_score = 9999999999;
  target.forEach( (v, i) => {
    if (v[attr] < tmp_score) {
      tmp_score = v[attr];
      tmp_ranking = i + 1;
    }
    v[`${attr}_rank`] = tmp_ranking;
  })
}

const get_ranked_json = (tags, min_item_count, min_followers_count, num, weight) =>{
  tags = tags.filter( v => v.items_count > min_item_count);
  let total_items_count = tags.reduce( (s, v) => v.items_count + s, 0)
  console.log()
  tags = tags.filter( v => v.followers_count > min_followers_count);
  let total_followers_count = tags.reduce( (s, v) => v.followers_count + s, 0)
  console.log(`min_item_count: ${min_item_count}, min_followers_count: ${min_followers_count}, total_items_count: ${total_items_count}, total_followers_count: ${total_followers_count}, record_count: ${tags.length}`)

  tags = JSON.parse(JSON.stringify(tags)); // 属性を書き換えるのでオブジェクトをコピーする

  set_rank(tags, 'items_count');
  set_rank(tags, 'followers_count');
  tags.forEach( t => {
    t.items_point = t.items_count * 100 / total_items_count;
    t.followers_point = t.followers_count * 100 / total_followers_count;
    t.score = (t.items_point * weight.item_count + t.followers_point * weight.followers_count) / (weight.item_count + weight.followers_count);
    t.diff = t.followers_point - t.items_point;
  })
  set_rank(tags, 'score', true);
  return tags.slice(0, num);
}

const to_chart_data = v => {
  return { label: v.id, data: [ { x: v.followers_count, y: v.items_count, r: 10 } ] }
};

fs.readFile('./tags.json', 'utf8', function (err, text) {
  let tags = JSON.parse(text);

  // 末尾のデータと同スコアのデータを削除(ページ途中のため)
  let min_items_count = tags[tags.length -1].items_count;
  console.log(`min_items_count: ${min_items_count}`);
  tags = tags.filter( v => v.items_count > min_items_count);

  let tags_array = OUTPUT_VARS.map( v => get_ranked_json(tags, v.min_item_count, v.min_followers_count, OUTPUT_RANKING_NUM, WEIGHT) );

  OUTPUT_VARS.forEach( (v, i) => {
    let tags = tags_array[i];
    let str = '"タグ名",評価値順位,フォロワー数順位,記事数順位,評価値,フォロワー数,記事数,評価値差分,\n';
    str += tags.map( v => `"${v.id}",${v.score_rank},${v.followers_count_rank},${v.items_count_rank},${v.score},${v.followers_count},${v.items_count},${v.diff}`).join('\n')
    fs.writeFile(`list_${v.min_item_count}_${v.min_followers_count}.csv`, str , (err, data) => {});
    fs.writeFile(`chart_over_${v.min_item_count}_${v.min_followers_count}.json`, JSON.stringify(tags.filter( v => v.score > CHART_SCORE ).map(to_chart_data)) , (err, data) => {});
    fs.writeFile(`chart_under_${v.min_item_count}_${v.min_followers_count}.json`, JSON.stringify(tags.filter( v => v.score <= CHART_SCORE ).map(to_chart_data)) , (err, data) => {});
  });
});
```

</div></details>

<details><summary>出力結果全数</summary><div>

上位300件の結果(条件： 記事数7件以上, 対象件数： 6,755件)

``` csv
"タグ名",評価値順位,フォロワー数順位,記事数順位,評価値,フォロワー数,記事数,評価値差分,
"JavaScript",1,1,2,3.21768262184516,57249,25543,1.1464502653331907
"Python",2,2,1,3.1510602645710697,52360,27383,0.6322164907616328
"Ruby",3,14,3,2.179157627169427,32580,21259,-0.04355780383341301
"PHP",4,9,4,1.9955708608329905,35692,15722,0.735755851183626
"Java",5,7,9,1.858304727392614,37825,11706,1.2927736196582436
"Android",6,11,8,1.783415912917948,34883,12141,1.0529252074968634
"HTML",7,3,27,1.6912270340718756,43748,4690,2.4113460836276435
"Linux",8,12,12,1.6574780636202067,34694,9829,1.2797705451916241
"iOS",9,18,6,1.6305229075127565,27848,13687,0.42702556255814317
"GitHub",10,5,30,1.5375539566016885,39610,4368,2.17067301419136
"Git",11,13,14,1.532615828779509,33651,8084,1.3913645047171816
"CSS",12,8,22,1.499440203921993,36603,5555,1.848666153262541
"Rails",13,29,5,1.4608968586733848,20539,15085,-0.20169539702966577
"Qiita",14,4,86,1.4480496547636665,41164,1645,2.555486807495564
"HTML5",15,6,48,1.4174956942770038,38759,2593,2.2980866969014984
"Mac",16,19,15,1.2832836164369978,27085,7467,1.0204556507030413
"iPhone",17,10,68,1.2744976160216894,35475,1931,2.1491637782905846
"Node.js",18,21,13,1.2457835283066796,24847,8174,0.7990645693138572
"MySQL",19,17,19,1.2330516213505849,27863,5999,1.2239546714619094
"jQuery",20,16,36,1.1228205329632428,28114,3709,1.4776582269989282
"C#",21,26,17,1.0914635026999155,21762,7166,0.6991402640261791
"C++",22,22,21,1.082569516119267,23615,5809,0.9623317226321225
"Chrome",23,15,81,1.0646622438926028,29500,1699,1.777530785078837
"Xcode",24,30,24,0.9413350362595791,20156,5293,0.786705347136694
"CSS3",25,20,105,0.9262074894001051,25892,1332,1.5766120288267658
"Vim",26,25,39,0.9156448494484357,22088,3561,1.0939516321885856
"MacOSX",27,23,47,0.913234911137401,23488,2619,1.284181589556745
"AWS",28,51,7,0.8580777815523354,5981,12751,-0.9240572110029814
"Ubuntu",29,34,26,0.8575304235307305,18516,4723,0.7371199065775429
"CentOS",30,32,29,0.857426170980943,18652,4634,0.7553396766638811
"Twitter",31,24,95,0.8189460007985936,22496,1432,1.341383124448559
"C",32,28,49,0.8150238400774003,20603,2567,1.0985265295678392
"Swift",33,49,10,0.8137544689929062,6495,11566,-0.7673385990959153
"Objective-C",34,35,33,0.7674008609734816,17043,3924,0.7223011395927614
"ShellScript",35,31,57,0.7613399798398038,19374,2316,1.043130686302357
"正規表現",36,27,157,0.748123783016628,21270,848,1.3206613035876995
"Apache",37,33,64,0.7223168203804617,18605,2054,1.0193338965826535
"Docker",38,52,11,0.7103711337196461,5824,9998,-0.6494363315355572
"SSH",39,36,69,0.6552768394758617,16810,1907,0.9156916477209734
"nginx",40,38,51,0.5694908852415373,13345,2466,0.628373606343049
"Unity",41,54,16,0.5160823518574145,4357,7183,-0.4551420452786041
"Facebook",42,37,212,0.5154069554987848,14557,646,0.8970536214458839
"Emacs",43,40,73,0.4758085302159235,11452,1867,0.5650374000711704
"Scala",44,44,45,0.46490211247834695,9667,2798,0.3504523825950586
"Heroku",45,43,53,0.45677440785709644,10000,2428,0.41080890390073677
"Perl",46,39,94,0.45583284443385663,11485,1460,0.6093591521100337
"機械学習",47,53,25,0.45443706940106304,5547,5231,-0.17425291173172452
"Go",48,55,20,0.43454837138038316,3966,5858,-0.34385647116148516
"Python3",49,61,18,0.4203174039147366,2645,6428,-0.4903421909913242
"CoffeeScript",50,41,137,0.41917527181437875,11072,1016,0.6279783235288927
"MongoDB",51,42,121,0.4094374585716315,10559,1156,0.5795143989981413
"Haskell",52,45,71,0.39279282874283944,8904,1893,0.3936224560594547
"Zsh",53,46,102,0.35641385782141566,8637,1361,0.4310200467885834
"RaspberryPi",54,57,31,0.3292764952215915,3202,4313,-0.23449364862248262
"Windows",55,90,23,0.3235343696604238,1204,5480,-0.48761606987921
"初心者",56,68,28,0.30365726780959407,1881,4663,-0.35820284855961987
"DeepLearning",57,56,40,0.29257010418109863,3452,3444,-0.12797192355112358
"Vue.js",58,58,37,0.2877410295163999,2970,3659,-0.18214781630716564
"TDD",59,47,400,0.2748751810090537,7769,341,0.4791431503507316
"Laravel",60,67,32,0.27152238375409204,1947,4000,-0.28519231949915724
"Vagrant",61,74,34,0.25255474342418566,1593,3860,-0.294139302113713
"Backbone.js",62,48,481,0.25145669865205816,7168,273,0.44638621611586526
"React",63,62,41,0.23649233920489884,2540,2944,-0.13659781762760553
"Bash",64,87,38,0.23081547923031426,1296,3630,-0.28999419799853365
"TypeScript",65,63,43,0.22140654670809137,2211,2863,-0.1499976016093218
"golang",66,66,42,0.2172639354290536,1978,2932,-0.17256991391827406
"Scheme",67,50,700,0.21696670740331558,6267,183,0.3960415680760453
"TensorFlow",68,59,55,0.21643740831280947,2802,2389,-0.061789783589515646
"WordPress",69,72,44,0.2048744203825091,1732,2850,-0.1803700837277124
"R",70,69,46,0.19977604198149673,1861,2669,-0.15308911234265501
"Kotlin",71,64,52,0.19758366257265994,2145,2445,-0.11109259428791746
"#migrated",72,4907,35,0.19734193904754185,2,3811,-0.39441900655116074
"Slack",73,65,54,0.19454317375953079,2086,2424,-0.11282532720738725
"新人プログラマ応援",74,60,77,0.18006376193170726,2679,1765,-0.005332090778574827
"MachineLearning",75,70,66,0.16164925686756948,1807,1967,-0.08398707380072114
"Ansible",76,81,63,0.1577819767952563,1476,2104,-0.12008875417534894
"PostgreSQL",77,96,56,0.15640515132761396,1067,2339,-0.17150133397231493
"SQL",78,86,61,0.15587447592419268,1298,2181,-0.13984731984236748
"Django",79,83,65,0.14903762126006168,1387,1992,-0.1143868268095326
"IoT",80,92,62,0.1488785428026703,1168,2129,-0.1430721039543168
"RubyOnRails",81,157,50,0.14885222421164698,534,2534,-0.22698374619585673
"Azure",82,98,60,0.14862464443379697,1029,2213,-0.16097287951921765
"kubernetes",83,84,67,0.1450172902007681,1350,1938,-0.11124628825352068
"Firebase",84,79,75,0.14349857633903645,1498,1814,-0.0886083662797564
"reactjs",85,77,79,0.1395331858800896,1508,1731,-0.07935322764224778
"lambda",86,128,59,0.13766373965665502,687,2220,-0.18434410397576437
"GoogleAppsScript",87,75,84,0.1374597214907468,1547,1666,-0.07004130375706401
"VSCode",88,73,88,0.13737279368082644,1646,1601,-0.05675630671303544
"Arduino",89,89,74,0.1373581511949422,1250,1854,-0.10917158743801823
"OpenCV",90,85,83,0.13014080044254595,1315,1673,-0.08612856075572863
"ATOM",91,71,106,0.12688718491960954,1753,1330,-0.02161446159072189
"centos7",92,272,58,0.12592554498761133,284,2251,-0.21423933073815865
"AngularJS",93,76,97,0.12455398410882389,1534,1425,-0.04595149402871754
"Elixir",94,91,85,0.12429630173637304,1176,1649,-0.09284813564603034
"Excel",95,107,76,0.12366211668089806,902,1812,-0.12786716705252946
"PowerShell",96,100,82,0.12074862440666595,1011,1686,-0.10760468336026248
"Rust",97,79,115,0.11388910047852399,1498,1242,-0.029389414558731508
"VirtualBox",98,172,72,0.11353519233441231,482,1885,-0.16323634258338499
"AndroidStudio",99,123,80,0.11279930230656758,724,1716,-0.12971510571301423
"数学",100,97,92,0.11266808297694353,1064,1496,-0.08442450458685856
"Eclipse",101,82,110,0.1125350189999911,1393,1283,-0.040587007657622506
"Windows10",102,253,70,0.10869339455625622,317,1897,-0.17540464940071918
"GoogleCloudPlatform",103,103,96,0.1057336514222491,964,1426,-0.08379921867361897
"Jenkins",104,94,108,0.10324637259998702,1089,1298,-0.0622701895339082
"api",105,159,86,0.10253532057788824,525,1645,-0.13554186087599265
"EC2",106,262,78,0.10087926520720084,303,1755,-0.1616304915100693
"Elasticsearch",107,99,111,0.09996387092478727,1018,1280,-0.06510812599277468
"Markdown",108,101,109,0.09926253566775622,989,1285,-0.06754609286559592
"VisualStudio",109,104,107,0.09922809558968548,952,1308,-0.07237733627202965
"ポエム",110,167,89,0.09904288795911222,493,1598,-0.1327949403412084
"JSON",111,180,90,0.09624810130271046,468,1560,-0.13051626132744218
"Keras",112,105,113,0.09624254737690306,940,1258,-0.06799546911000273
"VisualStudioCode",113,88,131,0.0958753626394416,1276,1036,-0.022762680256018172
"homebrew",114,178,91,0.09470960983261448,470,1529,-0.12717440684332726
"webpack",115,121,104,0.09426329467787352,727,1356,-0.09224578313974166
"Electron",116,78,159,0.09340468564313509,1500,845,0.011844286655969302
"oracle",117,145,99,0.09284955627984111,603,1408,-0.10584034206690193
"VBA",118,108,117,0.09190660698024455,845,1235,-0.07190498665302753
"shell",119,153,100,0.09045915141805302,548,1397,-0.10834349980120789
"Jupyter",120,118,118,0.08724746925524389,759,1200,-0.07397618759171462
"docker-compose",121,241,93,0.08684208041995639,334,1464,-0.12945061300477412
"gcp",122,133,116,0.0862720392176479,667,1240,-0.08420941853697998
"自然言語処理",123,93,146,0.08626279599718373,1117,952,-0.024594834713379796
"npm",124,206,98,0.0860459252514434,385,1416,-0.121104078297712
"spring-boot",125,143,114,0.08566213868802641,622,1257,-0.08894922721600418
"OSX",126,217,101,0.08333180954906516,364,1377,-0.1184569981041469
"CakePHP",127,116,124,0.08330073467124463,768,1118,-0.06489079647606265
"spring",128,111,129,0.08251482976386963,824,1067,-0.05590258343146904
"RSpec",129,170,112,0.08236436632195149,488,1279,-0.1001000759266944
"Bootstrap",130,102,144,0.08200855357904477,976,960,-0.03475979372367238
"Angular",131,106,140,0.08168033582096544,927,985,-0.0405927110336269
"Selenium",132,119,127,0.08118309345494112,740,1095,-0.06436371565837744
"Blockchain",133,122,125,0.08094528339977532,725,1100,-0.06587463212746822
"pandas",134,147,120,0.08039104638441222,591,1175,-0.08251255153958208
"アルゴリズム",135,109,136,0.08022456935388504,833,1017,-0.05013014066384644
"Chainer",136,95,168,0.07734346310873164,1079,804,-0.011788728271012336
"S3",137,344,103,0.07705084712978423,204,1358,-0.1270847967794239
"gulp",138,128,135,0.07559772294904238,687,1021,-0.06021207056053909
"reactnative",139,138,132,0.07512630564561557,654,1033,-0.06363961642841474
"chef",140,120,143,0.07440610511197332,737,966,-0.0512070462883263
".NET",141,137,139,0.07310327493913038,657,992,-0.05919624769955988
"GitLab",142,140,138,0.07292747996304053,647,995,-0.0601690154669951
"セキュリティ",143,124,147,0.0726755209504163,716,946,-0.050527029176403615
"Redmine",144,117,152,0.07144054390921886,760,894,-0.04222990112770306
"Unity3D",145,132,148,0.07123318052688266,674,945,-0.053204650751719054
"Bluemix",146,158,134,0.07084684638604782,531,1029,-0.07137029786054289
"Xamarin",147,112,162,0.07063178031999148,820,840,-0.03266622763155872
"redux",148,139,149,0.07004310322655762,649,938,-0.05413539045010629
"IntelliJ",149,135,151,0.06924981972986904,661,915,-0.05095959419319124
"Sass",150,114,165,0.0683738112301649,769,829,-0.0349045138219417
"AdventCalendar",151,365,119,0.067298560835172,194,1176,-0.10890458190981436
"numpy",152,203,133,0.06639999776419983,392,1032,-0.0808851729194944
"オブジェクト指向",153,131,162,0.06593031041535848,678,840,-0.04206916744082472
"Web",154,286,125,0.06551651596626139,259,1100,-0.09673216699449609
"データ分析",155,126,168,0.06522558997425502,713,804,-0.03602447453996555
"aws-cli",156,483,122,0.06335941424214996,136,1137,-0.10870756349753685
"gradle",157,192,145,0.06333695437980265,423,953,-0.07065357721989377
"Ethereum",158,184,150,0.06293677539209376,450,928,-0.06627745340151567
"Gem",159,578,123,0.06225421070275324,112,1131,-0.10967561494581927
"nuxt.js",160,150,158,0.062168499335170324,555,846,-0.050835145231712044
"matplotlib",161,230,141,0.0619221889572742,349,973,-0.07762429349998735
"es6",162,172,153,0.061511550306763675,482,880,-0.05918905852808774
"Rails5",163,556,128,0.0599163882817355,118,1082,-0.10420535547201482
"Rails4",164,496,130,0.059499911578655425,132,1065,-0.10151830125839377
"UI",165,134,191,0.05859651749578751,666,706,-0.0289908108652207
"Redis",166,152,175,0.05792798707116249,552,766,-0.042751428019580866
"Fluentd",167,142,187,0.05780846383049976,625,717,-0.03284457018506642
"google",168,197,161,0.05712753438682399,409,842,-0.06008883804139735
"Network",169,192,164,0.05712517622724759,423,833,-0.058230020914783645
"深層学習",170,114,230,0.0564161382864964,769,598,-0.010989167934604714
"プログラミング",171,224,154,0.05630452713121747,356,860,-0.06546191944414344
"どう書く",172,418,142,0.0554864455964274,164,967,-0.08925342459116994
"画像処理",173,164,181,0.05515236980195633,501,745,-0.043954417851204665
"電子工作",174,163,184,0.05501757587041843,511,736,-0.04236047226851395
"Salesforce",175,198,170,0.05499072378332489,407,802,-0.05608008837832214
"デザインパターン",176,141,204,0.05494274296896444,626,661,-0.02698069269003428
"競技プログラミング",177,174,179,0.054531705498948826,476,749,-0.04602398354422701
"cocos2d-x",178,156,193,0.05399621906745403,538,699,-0.036741992819624834
"gas",179,191,176,0.053516092039633256,425,762,-0.05074698099563199
"統計学",180,125,239,0.05350808524532874,714,577,-0.012457029310151496
"GoogleHome",181,130,237,0.052599690716545876,685,578,-0.014480877639469064
"java8",182,263,166,0.05234252185634304,302,818,-0.0646894405803152
"スクレイピング",183,164,197,0.051787656635989,501,680,-0.03722499151927002
"Express",184,195,182,0.05177710226426664,410,738,-0.04925553802432117
"Flutter",185,149,216,0.051440573601298445,564,633,-0.02818737181631486
"Terminal",186,220,177,0.05107207771257883,359,757,-0.05459971329098169
"zabbix",187,171,199,0.050843795004639356,485,672,-0.037456240607954626
"WPF",188,183,195,0.050618593370187946,461,683,-0.04018429586612764
"AI",189,182,197,0.05052951680235482,463,680,-0.03974127118653839
"WebGL",190,167,208,0.050280429461555004,493,656,-0.03527002334609397
"tmux",191,148,223,0.05016090622089227,566,607,-0.0253631655115795
"Linuxコマンド",192,392,155,0.05011920224625086,177,855,-0.07679727285531747
"ディープラーニング",193,127,266,0.05006270112533788,710,513,-0.006096004158015748
"Clojure",194,154,220,0.04967267768984626,545,611,-0.027167859660678854
"CircleCI",195,237,185,0.04927107285813627,339,735,-0.053646419021326414
"Hubot",196,160,221,0.04882629824013934,521,610,-0.028653559288340846
"Julia",197,146,248,0.04869836938566702,600,557,-0.017935275594438242
"人工知能",198,113,312,0.048535277539212274,778,440,0.005964475507616994
"linebot",199,202,201,0.04775625769272505,398,668,-0.042803078144775894
"vmware",200,249,190,0.04739544450390337,323,709,-0.05201413466424451
"Spark",201,169,228,0.047352693520943734,489,602,-0.029944294552717403
"macos",202,453,166,0.047210635692835186,147,818,-0.07495321290733091
"Bitcoin",203,189,217,0.04689624279780772,433,629,-0.03644779633628899
"Debian",204,284,183,0.04689143176973419,264,737,-0.05881981974163424
"Security",205,207,205,0.04662399266457116,381,657,-0.04278995621181349
"Flask",206,195,214,0.04660062047047076,410,638,-0.03890257443672941
"scikit-learn",207,176,232,0.04651236152547001,473,596,-0.03038260291315384
"node-red",208,240,196,0.046343336917525,335,681,-0.04832069022794985
"Alexa",209,181,234,0.04611085140268073,464,594,-0.03077150461522872
"Pepper",210,136,297,0.04607783716861108,660,468,-0.004748064842636783
"SQLServer",211,221,209,0.04575895733991665,358,655,-0.04410590831761882
"UE4",212,155,257,0.04534308885800531,544,528,-0.018641117768958437
"UNIX",213,233,211,0.044947531480528505,346,647,-0.044072285862380434
"cppBuilder",214,1774,156,0.04476580374294839,20,852,-0.08688289204666691
"Anaconda",215,322,186,0.04473883696311192,224,721,-0.059812061006849424
"メモ",216,1437,159,0.044701430504296036,29,845,-0.08556222362170879
"SSL",217,447,174,0.04465550373892763,148,768,-0.06971051322755428
"テスト",218,260,202,0.04462536117668238,305,667,-0.048857811905109405
"TechEnglish",219,596,171,0.04459215752477129,107,793,-0.07501368744966283
"swift4",220,521,172,0.044115510389943664,127,771,-0.07141167774077771
"processing",221,144,299,0.04402692735053633,609,461,-0.007400469576523426
"Angular2",222,150,280,0.04399904823894677,555,495,-0.014496243039264944
"LaTeX",223,224,219,0.04372567637229347,356,617,-0.040304217926295446
"Dart",224,211,228,0.043478947191070066,372,602,-0.03769178721246474
"ゲーム制作",225,272,205,0.04341242519450495,284,657,-0.0492130911519459
"環境構築",226,468,180,0.04333667996129788,141,747,-0.06799991607602524
"VR",227,201,241,0.042956582692537666,400,574,-0.03293885660047814
"PlayFramework",228,227,226,0.042802315263219815,350,603,-0.03925211033991708
"Raspberrypi3",229,295,203,0.04245042120045574,244,664,-0.052586514042307186
"ROS",230,221,235,0.04229071453807341,358,588,-0.037169422713932344
"BigQuery",231,241,226,0.042272572175373835,334,603,-0.040311596515609026
"入門",232,430,188,0.042195495807086376,155,716,-0.06386344696014133
"FuelPHP",233,203,249,0.04175994442573142,392,556,-0.0316050662425576
"勉強会",234,309,205,0.04165765121601517,231,657,-0.05272263910892546
"Erlang",235,187,263,0.04150009331154561,442,519,-0.02446357541611132
"SublimeText",236,175,280,0.04131722385672654,474,495,-0.019859891803705405
"test",237,453,192,0.041309446447907884,147,704,-0.0631508344174763
"備忘録",238,1096,173,0.04128259436081434,43,770,-0.0768704505272845
"raspbian",239,410,194,0.04128002679957429,168,690,-0.06031084390961777
"PHP7",240,521,189,0.041061386131604094,127,712,-0.06530342922409857
"serverless",241,249,236,0.04071778298990668,323,580,-0.038658811636251136
"ubuntu16.04",242,1160,177,0.040510324898649766,40,757,-0.07572321891883982
"GAE",243,237,246,0.040160464901055515,339,559,-0.03542520310716492
"Line",244,244,244,0.040117105696927155,333,562,-0.03613309933067714
"babel",245,288,224,0.0398453690759386,256,606,-0.045787180529735
"Terraform",246,210,259,0.03937087069902373,373,522,-0.02934319845641058
"DDD",247,178,300,0.03932125463899853,470,459,-0.01639769645609536
"Cordova",248,208,267,0.03908498512057676,380,512,-0.02784437689578618
"FPGA",249,200,278,0.03903690959729558,402,497,-0.02483463886607099
"nodejs",250,199,282,0.038980941972452825,405,494,-0.024325396300500995
"openFrameworks",251,160,331,0.038576864288423496,521,412,-0.008154691384909159
"PhpStorm",252,205,285,0.038258592680897804,391,489,-0.02473479852485186
"cakephp3",253,324,232,0.03816890789189595,221,596,-0.047069510180301956
"Phoenix",254,212,277,0.038114062000469934,371,499,-0.027094452603225967
"Kaggle",255,176,318,0.03786763692983088,473,429,-0.013093153721875583
"TeX",256,209,284,0.03779927028593738,374,491,-0.026067561858276387
"Swift3.0",257,308,237,0.037601339541906795,232,578,-0.044477579988747226
"Watson",258,244,270,0.03742533516415329,333,510,-0.030749558265129425
"HTTP",259,568,210,0.0374028952856282,115,649,-0.059575676795684714
"ESP8266",260,255,261,0.03726635141568263,311,521,-0.03334517775134094
"hadoop",261,190,315,0.036994709503614796,431,439,-0.01690960129182612
"firefox",262,292,250,0.03698805382821288,251,554,-0.040734728894091014
"tips",263,797,200,0.03698560095971575,68,671,-0.06496556942604999
"Elm",264,186,319,0.03682260382218173,443,428,-0.014976160665422067
"C言語",265,258,265,0.0368046708611458,308,514,-0.03281912395815176
"GoogleAnalytics",266,219,291,0.03666280245087869,360,478,-0.025648726995619906
"APIGateway",267,403,231,0.03663144344629599,173,597,-0.0503514983432537
"Groovy",268,280,255,0.03636031504647617,268,531,-0.037227843207272224
"AtCoder",269,336,244,0.03611092359509199,212,562,-0.04414546353434747
"ifttt",270,216,300,0.03587792456799971,366,459,-0.023284356598092994
"archLinux",271,241,290,0.03585373475106694,334,479,-0.027473921666995235
"vue",272,110,800,0.03581455837002116,830,161,0.03829257398799685
"フロントエンド",273,227,298,0.035555240751905574,350,463,-0.024757961317288607
"mecab",274,318,254,0.03507326907675641,226,533,-0.04021605369021541
"Qt",275,213,312,0.035026828799139986,370,440,-0.021052421972527574
"CSV",276,885,215,0.03487585184497383,59,636,-0.061937993144219584
"強化学習",277,187,357,0.034718902161673004,442,388,-0.010901193116366108
"bot",278,331,256,0.034468902489120094,214,529,-0.04059654977848069
"cloud9",279,346,253,0.0344670578417917,203,536,-0.042049653975400336
"Maven",280,371,252,0.034380339433534975,191,542,-0.043465446422424794
"laravel5",281,444,242,0.03436875803731661,150,568,-0.04887215028040926
"GoogleSpreadSheet",282,296,271,0.03430889171615341,242,508,-0.036568326617625525
"chrome-extension",283,290,283,0.03389661781997813,253,493,-0.03428698533369855
"yhpg",284,1774,213,0.03379166234010112,20,640,-0.06493460924097237
"python2.7",285,797,225,0.033569122975810474,68,605,-0.05813261345823943
"Lua",286,254,310,0.033446005149411664,316,444,-0.025042306358991556
"初心者向け",287,556,243,0.03315397740781078,118,565,-0.050680533724165394
"rbenv",288,994,222,0.033147112330745215,49,609,-0.05980487183537728
"WSL",289,354,268,0.03304050162138124,199,511,-0.039726284622425376
"scss",290,266,308,0.0330384475723892,299,447,-0.026478599328291996
"kintone",291,313,287,0.03284317909851939,229,488,-0.035358566417856875
"mariadb",292,398,259,0.03278219104393945,174,522,-0.042520557766579134
"SoftLayer",293,575,246,0.03267784378523116,113,559,-0.05039044533881362
"memo",294,2753,218,0.03259922688019967,9,624,-0.0640065318127459
"WebAPI",295,297,293,0.03255309071316761,239,476,-0.0334540319275384
"PHPUnit",296,354,274,0.03252285344200165,199,501,-0.038690988263666196
"ASP.NET",297,230,337,0.032468007550575634,349,404,-0.018715930686590214
"C++11",298,357,275,0.03243797968107332,198,500,-0.03865367651377103
"DynamoDB",299,422,263,0.032262698217231475,163,519,-0.04293836560473959
"Realm",300,194,385,0.032182939594961026,417,355,-0.009140162281979485
```

上位300件の結果(条件： 記事数20件以上, フォロワー数20ユーザ以上, 対象件数： 1,728件)

``` csv
"タグ名",評価値順位,フォロワー数順位,記事数順位,評価値,フォロワー数,記事数,評価値差分,
"JavaScript",1,1,2,3.3320832274656484,57249,25543,1.0659276985849786
"Python",2,2,1,3.267865727807725,52360,27383,0.534221379859618
"Ruby",3,14,3,2.264614924831501,32580,21259,-0.1300880738842074
"PHP",4,9,4,2.0662800675310984,35692,15722,0.6867820460641616
"Java",5,7,9,1.918236723102188,37825,11706,1.270878845656672
"Android",6,11,8,1.8427598698383139,34883,12141,1.024586539159827
"HTML",7,3,27,1.7337534629160989,43748,4690,2.4396033997285986
"Linux",8,12,12,1.709700104129433,34694,9829,1.265186187347933
"iOS",9,18,6,1.689992072668991,27848,13687,0.38021536883905616
"Git",10,13,14,1.57887955561785,33651,8084,1.3859953361778121
"GitHub",11,5,30,1.5764261141147944,39610,4368,2.1955211830226546
"CSS",12,8,22,1.5399588997187954,36603,5555,1.8624329193724538
"Rails",13,29,5,1.5198657454246258,20539,15085,-0.2664358207227726
"Qiita",14,4,85,1.479684222142889,41164,1645,2.598835117965859
"HTML5",15,6,47,1.4504430368235364,38759,2593,2.3325803501531213
"Mac",16,19,15,1.3234277954841396,27085,7467,1.010319209429777
"iPhone",17,10,67,1.3033143226599828,35475,1931,2.1834129291353066
"Node.js",18,21,13,1.286618994848926,24847,8174,0.7817489870601507
"MySQL",19,17,19,1.2692552261317906,27863,5999,1.2237144494713657
"jQuery",20,16,35,1.1522537330885656,28114,3709,1.4916089206934962
"C#",21,26,17,1.1272496806896173,21762,7166,0.6839329076354413
"C++",22,22,21,1.1154472502535842,23615,5809,0.9577406448278916
"Chrome",23,15,80,1.0889076650223113,29500,1699,1.8054468671768156
"Xcode",24,30,24,0.970410831342386,20156,5293,0.7807591117964247
"CSS3",25,20,104,0.9470055862017283,25892,1332,1.602077804222221
"Vim",26,25,38,0.940728049128628,22088,3561,1.1009945936826468
"MacOSX",27,23,46,0.9363727466459981,23488,2619,1.2987413707194322
"AWS",28,51,7,0.9005539854814664,5981,12751,-0.9935184387059355
"Ubuntu",29,34,26,0.8838186277581637,18516,4723,0.7325011459667966
"CentOS",30,32,29,0.8835329916266372,18652,4634,0.7514359320882259
"Swift",31,49,10,0.8529759314440035,6495,11566,-0.8289590503133208
"Twitter",32,24,94,0.8378478803073486,22496,1432,1.361845472900336
"C",33,28,48,0.8361361620305575,20603,2567,1.1096649996457761
"Objective-C",34,35,33,0.7903163164440739,17043,3924,0.7206127104082922
"ShellScript",35,31,56,0.7808966065456808,19374,2316,1.0541973567041687
"正規表現",36,27,155,0.7644637586890402,21270,848,1.3430720397371738
"Docker",37,52,11,0.7444110226848657,5824,9998,-0.7024315695521838
"Apache",38,33,63,0.7405823070509472,18605,2054,1.0309910868914907
"SSH",39,36,68,0.6719349946817397,16810,1907,0.9259143338667708
"nginx",40,38,50,0.5855977582600262,13345,2466,0.6307242808331709
"Unity",41,54,16,0.540649975679613,4357,7183,-0.4929923787051987
"Facebook",42,37,210,0.5267886030540699,14557,646,0.9119939059241474
"Emacs",43,40,72,0.488876193807135,11452,1867,0.5685634999308118
"Scala",44,44,44,0.4796325441726864,9667,2798,0.34602967980851346
"機械学習",45,53,25,0.4738655949231585,5547,5231,-0.19874287093149268
"Heroku",46,43,52,0.4706002945509411,10000,2428,0.4090577828375883
"Perl",47,39,93,0.4676896913390296,11485,1460,0.6153923574944229
"Go",48,55,20,0.4548514041404256,3966,5858,-0.374190337969657
"Python3",49,61,18,0.4414907317418288,2645,6428,-0.5258381241056677
"CoffeeScript",50,41,136,0.4294204929669849,11072,1016,0.636165083477412
"MongoDB",51,42,120,0.41977435118345524,10559,1156,0.5861891125639765
"Haskell",52,45,70,0.4042893352842439,8904,1893,0.3936913838064168
"Zsh",53,46,101,0.36612685767249065,8637,1361,0.4339644404991394
"RaspberryPi",54,57,31,0.3444073675396834,3202,4313,-0.2564620043843482
"Windows",55,90,23,0.34090457459920126,1204,5480,-0.5192380412168903
"初心者",56,68,28,0.3189923893978674,1881,4663,-0.3840011790339203
"DeepLearning",57,56,39,0.3052319746785893,3452,3444,-0.1443547593636733
"Vue.js",58,58,36,0.3007417055457738,2970,3659,-0.20045667462552477
"Laravel",59,67,32,0.2848930215854115,1947,4000,-0.30689073815420814
"TDD",60,47,390,0.28093810619193343,7769,341,0.48713951677590794
"Vagrant",61,74,34,0.26527231315715316,1593,3860,-0.3154484676643487
"Backbone.js",62,48,465,0.2569245978329115,7168,273,0.45401600534038955
"React",63,62,40,0.24704993438196213,2540,2944,-0.15113424229129874
"Bash",64,87,37,0.2426444160139553,1296,3630,-0.3102953470245552
"TypeScript",65,63,42,0.23150588306730202,2211,2863,-0.16446964009878706
"golang",66,66,41,0.2274212966702188,1978,2932,-0.18776148737081028
"TensorFlow",67,59,54,0.22548440086595364,2802,2389,-0.07262640591446762
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"mariadb",288,398,255,0.03447520390866584,174,522,-0.04545591214558489
"kintone",289,313,283,0.03446887100976692,229,488,-0.03801682530211996
"SoftLayer",290,575,242,0.03444337494827228,113,559,-0.05362883029362855
"PHPUnit",291,354,270,0.034168477115638904,199,501,-0.04146681262968235
"WebAPI",292,297,289,0.034148928016758014,239,476,-0.036026680944162684
"C++11",293,357,271,0.0340799283575076,198,500,-0.041424740950613693
"DynamoDB",294,422,259,0.03393950595988404,163,519,-0.04586980045715472
"ASP.NET",295,230,331,0.03391709302362892,349,404,-0.020710168866570317
"ActiveRecord",296,829,235,0.03380932628093558,65,577,-0.0588419731442646
"Realm",297,194,376,0.03352770961311811,417,355,-0.010749645116360295
"CI",298,357,281,0.03347721307034665,198,489,-0.04021931037629178
"開発環境",299,293,298,0.03346647477145374,248,458,-0.033446541918808595
"SublimeText3",300,260,319,0.03330848559582053,305,420,-0.02543409084748721
```

</div></details>

（記事数7件以上を対象とした）評価値の上位10位は下記のとおり。

| タグ名 | 評価値順位 | フォロワー数順位 | 記事数順位 | 評価値(%) | フォロワー数 | 記事数 | 評価値差分(%) |
|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|
JavaScript|1|1|2|3.21|57249|25543|1.14
Python|2|2|1|3.15|52360|27383|0.63
Ruby|3|14|3|2.17|32580|21259|-0.04
PHP|4|9|4|1.99|35692|15722|0.73
Java|5|7|9|1.85|37825|11706|1.29
Android|6|11|8|1.78|34883|12141|1.05
HTML|7|3|27|1.69|43748|4690|2.41
Linux|8|12|12|1.65|34694|9829|1.27
iOS|9|18|6|1.63|27848|13687|0.42
GitHub|10|5|30|1.53|39610|4368|2.17

評価値の単位は%なので、記事/フォロワーの全体の何%がタグと関連があるかを表しています。
また評価値差分は、フォロワー数と記事数の差分なので、値が大きいほうがフォロワーに対する記事が少なく、値が小さいほうがフォロワーに対する記事が多くなります。

上記だと、Rubyのみ負の値であり、Rubyタグのついた記事は相対的に書かれやすいと想像できます。（逆にHTMLタグのついた記事は相対的に書かれにくい）

※タグは同意味で別単語等で登録されていたりもするので、上記はあくまでタグ名の話である点には注意して下さい。

なお、

| タグ名 | 評価値順位 | フォロワー数順位 | 記事数順位 | 評価値(%) | フォロワー数 | 記事数 | 評価値差分(%) |
|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|
#migrated|72|4907|35|0.19|2|3811|-0.39

記事数順位35位、フォロワー数2の「#migrated」とは。。

# \#migratedタグについて

[#migratedのタグページ](https://qiita.com/tags/%23migrated)のユーザランキングをみると、@7of9さんのみなので、個人識別用のタグと判明！（間違っていたらごめんなさい）

個人で3800over記事。。すごい。。。すごさをグラフで表したい！
（もちろんタグ付けせずに、それくらい記事書いている方もいらっしゃるかとは思いますが）

[ 5/22追記 ]
コメント欄にて、以下の回答をいただきました。ありがとうございます！

> `#migrated`タグ
>
> かつてQiitaがガイドラインを変更時に「Qiitaをやめよう」とした時のなごりですね。
> 他のサービスへ移行済の記事が#migratedタグです。
>
> その後、Qiitaで知り合った人たちとのやりとりを考慮して、Qiitaは継続的に使うことに考えを変えました。
>
> 付けた#migratedタグを消すと最終更新日が変更されるため、積極的には消していません。が、いいねされた記事については適宜消したりしています。

# CodePenとchart.jsでQiita上で可視化してみる

300件を全部一度に表示するとわけわからなくなったので、評価値が0.18以上のデータのみをグラフとした
※chart.jsは色とか付ければもっときれいに見えるけど~~疲れたので~~デフォルト設定のまま

<p class="codepen" data-height="860" data-theme-id="0" data-default-tab="result" data-user="j5c8k6m8" data-slug-hash="vwJgOm" style="height: 860px; box-sizing: border-box; display: flex; align-items: center; justify-content: center; border: 2px solid; margin: 1em 0; padding: 1em;" data-pen-title="qiita_tag_score_over_0_18">
  <span>See the Pen <a href="https://codepen.io/j5c8k6m8/pen/vwJgOm/">
  qiita_tag_score_over_0_18</a> by j5c8k6m8 (<a href="https://codepen.io/j5c8k6m8">@j5c8k6m8</a>)
  on <a href="https://codepen.io">CodePen</a>.</span>
</p>

<script async src="https://static.codepen.io/assets/embed/ei.js"></script>


表の左上のほう(AWS, Swift, Docker)⇒記事数がフォロワーに比べて多い⇒新しい・機能が豊富・広めたくなる
表の右下のほう(HTML, GITHUB)記事数がフォロワーに比べて少ない⇒枯れている・安定している・分かりやすい
みたいな傾向が見えて個人的には楽しかったからいいか。

※#migratedのすごさはあまり際立たなかったが、、Qiitaのタグのフォロワー数の多さが改めてすごいと思った。

# さいごに

~~そもそも私のpythonのスキルが低いのですが~~本格的な分析を目的としていない（ある程度使えそうなタグ名のランキングがほしかった）ので、python使わず、jsでこれくらいで満足しました。