Question: 对于招商轮船在2023年05月17日到2023年05月31日间双指数移动平均线，统计20日线与60日线的金叉次数。（平滑系数 alpha 取 2 / (n + 1)；从前 5n 个数据开始计算；初始值用首个数据点）使用不复权价格，写出指标公式，搜集原始数据，计算得出答案，保留四位小数。注意列出原始数据和关键计算过程。
Formula: DEMA = 2 * EMA1 - EMA2；EMA1 = EMA_n(P)；EMA2 = EMA_n(EMA1)
Data:
date,close
2022-02-21,4.49
2022-02-22,4.51
2022-02-23,4.61
2022-02-24,4.58
2022-02-25,4.5
2022-02-28,4.59
2022-03-01,4.49
2022-03-02,4.59
2022-03-03,4.75
2022-03-04,4.57
2022-03-07,4.51
2022-03-08,4.4
2022-03-09,4.32
2022-03-10,4.24
2022-03-11,4.39
2022-03-14,4.23
2022-03-15,3.82
2022-03-16,3.93
2022-03-17,3.89
2022-03-18,3.9
2022-03-21,3.87
2022-03-22,3.92
2022-03-23,3.86
2022-03-24,3.81
2022-03-25,3.84
2022-03-28,4.22
2022-03-29,4.64
2022-03-30,4.66
2022-03-31,4.72
2022-04-01,4.94
2022-04-06,4.96
2022-04-07,4.94
2022-04-08,4.9
2022-04-11,4.84
2022-04-12,5.0
2022-04-13,5.29
2022-04-14,5.47
2022-04-15,5.34
2022-04-18,5.14
2022-04-19,5.32
2022-04-20,5.15
2022-04-21,5.11
2022-04-22,5.43
2022-04-25,5.05
2022-04-26,4.78
2022-04-27,4.96
2022-04-28,5.04
2022-04-29,5.11
2022-05-05,5.13
2022-05-06,5.33
2022-05-09,5.36
2022-05-10,5.06
2022-05-11,5.28
2022-05-12,5.41
2022-05-13,5.79
2022-05-16,5.87
2022-05-17,5.83
2022-05-18,5.65
2022-05-19,5.73
2022-05-20,5.62
2022-05-23,5.58
2022-05-24,5.81
2022-05-25,6.0
2022-05-26,6.07
2022-05-27,6.08
2022-05-30,6.03
2022-05-31,6.05
2022-06-01,6.66
2022-06-02,6.64
2022-06-06,6.77
2022-06-07,6.97
2022-06-08,6.7
2022-06-09,6.25
2022-06-10,6.31
2022-06-13,5.96
2022-06-14,6.07
2022-06-15,5.9
2022-06-16,5.71
2022-06-17,5.61
2022-06-20,5.46
2022-06-21,5.63
2022-06-22,5.78
2022-06-23,5.96
2022-06-24,5.8
2022-06-27,5.89
2022-06-28,6.19
2022-06-29,5.91
2022-06-30,5.76
2022-07-01,5.63
2022-07-04,5.79
2022-07-05,6.21
2022-07-06,5.94
2022-07-07,5.66
2022-07-08,5.66
2022-07-11,5.73
2022-07-12,5.5
2022-07-13,5.58
2022-07-14,5.58
2022-07-15,5.41
2022-07-18,5.95
2022-07-19,6.27
2022-07-20,6.54
2022-07-21,6.59
2022-07-22,6.76
2022-07-25,6.88
2022-07-26,7.11
2022-07-27,7.0
2022-07-28,7.01
2022-07-29,6.92
2022-08-01,7.25
2022-08-02,7.05
2022-08-03,6.74
2022-08-04,6.55
2022-08-05,6.57
2022-08-08,6.55
2022-08-09,6.86
2022-08-10,6.76
2022-08-11,6.77
2022-08-12,7.05
2022-08-15,7.1
2022-08-16,7.59
2022-08-17,7.67
2022-08-18,7.68
2022-08-19,7.53
2022-08-22,8.28
2022-08-23,8.07
2022-08-24,7.88
2022-08-25,8.56
2022-08-26,7.73
2022-08-29,7.93
2022-08-30,7.85
2022-08-31,7.49
2022-09-01,7.01
2022-09-02,7.25
2022-09-05,7.6
2022-09-06,7.71
2022-09-07,7.61
2022-09-08,7.46
2022-09-09,7.24
2022-09-13,7.28
2022-09-14,7.6
2022-09-15,7.3
2022-09-16,7.12
2022-09-19,7.66
2022-09-20,7.85
2022-09-21,8.36
2022-09-22,8.17
2022-09-23,7.77
2022-09-26,7.74
2022-09-27,7.61
2022-09-28,7.51
2022-09-29,7.03
2022-09-30,7.1
2022-10-10,7.16
2022-10-11,7.37
2022-10-12,7.32
2022-10-13,7.08
2022-10-14,7.58
2022-10-17,8.1
2022-10-18,8.04
2022-10-19,8.66
2022-10-20,8.19
2022-10-21,8.07
2022-10-24,7.73
2022-10-25,7.79
2022-10-26,7.49
2022-10-27,7.47
2022-10-28,7.39
2022-10-31,6.97
2022-11-01,6.95
2022-11-02,7.5
2022-11-03,7.31
2022-11-04,8.04
2022-11-07,7.9
2022-11-08,7.34
2022-11-09,7.25
2022-11-10,7.17
2022-11-11,7.27
2022-11-14,7.11
2022-11-15,7.17
2022-11-16,7.37
2022-11-17,7.52
2022-11-18,7.16
2022-11-21,7.19
2022-11-22,7.4
2022-11-23,7.28
2022-11-24,7.11
2022-11-25,6.98
2022-11-28,6.91
2022-11-29,6.71
2022-11-30,6.57
2022-12-01,6.44
2022-12-02,6.08
2022-12-05,6.25
2022-12-06,6.19
2022-12-07,6.15
2022-12-08,6.11
2022-12-09,6.15
2022-12-12,6.21
2022-12-13,6.41
2022-12-14,6.17
2022-12-15,6.16
2022-12-16,6.14
2022-12-19,5.9
2022-12-20,6.01
2022-12-21,5.92
2022-12-22,5.7
2022-12-23,5.55
2022-12-26,5.68
2022-12-27,5.67
2022-12-28,5.7
2022-12-29,5.6
2022-12-30,5.59
2023-01-03,5.82
2023-01-04,5.72
2023-01-05,5.73
2023-01-06,5.85
2023-01-09,5.83
2023-01-10,5.75
2023-01-11,5.93
2023-01-12,6.07
2023-01-13,6.07
2023-01-16,6.13
2023-01-17,6.04
2023-01-18,6.29
2023-01-19,6.3
2023-01-20,6.34
2023-01-30,6.27
2023-01-31,6.39
2023-02-01,6.55
2023-02-02,6.59
2023-02-03,6.79
2023-02-06,6.81
2023-02-07,6.89
2023-02-08,7.14
2023-02-09,7.18
2023-02-10,7.38
2023-02-13,7.09
2023-02-14,7.27
2023-02-15,7.11
2023-02-16,6.93
2023-02-17,7.0
2023-02-20,7.09
2023-02-21,7.1
2023-02-22,7.09
2023-02-23,6.97
2023-02-24,7.18
2023-02-27,7.15
2023-02-28,7.04
2023-03-01,7.62
2023-03-02,7.59
2023-03-03,7.65
2023-03-06,7.52
2023-03-07,7.29
2023-03-08,7.33
2023-03-09,8.02
2023-03-10,7.95
2023-03-13,7.9
2023-03-14,7.48
2023-03-15,7.92
2023-03-16,7.33
2023-03-17,7.29
2023-03-20,7.18
2023-03-21,7.31
2023-03-22,7.22
2023-03-23,7.11
2023-03-24,6.99
2023-03-27,7.01
2023-03-28,6.97
2023-03-29,6.89
2023-03-30,7.07
2023-03-31,7.01
2023-04-03,6.45
2023-04-04,6.35
2023-04-06,6.55
2023-04-07,6.72
2023-04-10,6.81
2023-04-11,6.72
2023-04-12,6.84
2023-04-13,6.95
2023-04-14,7.1
2023-04-17,7.31
2023-04-18,7.32
2023-04-19,7.27
2023-04-20,7.17
2023-04-21,6.97
2023-04-24,6.8
2023-04-25,6.72
2023-04-26,6.69
2023-04-27,6.62
2023-04-28,6.63
2023-05-04,6.33
2023-05-05,6.12
2023-05-08,6.16
2023-05-09,6.15
2023-05-10,5.96
2023-05-11,6.03
2023-05-12,5.91
2023-05-15,6.07
2023-05-16,6.02
2023-05-17,5.99
2023-05-18,5.92
2023-05-19,5.87
2023-05-22,6.05
2023-05-23,5.9
2023-05-24,5.85
2023-05-25,5.76
2023-05-26,5.73
2023-05-29,5.81
2023-05-30,5.8
2023-05-31,5.71

Indicator data:
date,20日,60日
2022-08-12,6.937561165779119,6.717432947736365
2022-08-15,6.9910277767846924,6.758834451355521
2022-08-16,7.124672528407986,6.829536761565911
2022-08-17,7.252806463152608,6.901656244177065
2022-08-18,7.363294274014734,6.970595049335012
2022-08-19,7.429400674525319,7.026175162357713
2022-08-22,7.620481871546226,7.127086119837583
2022-08-23,7.744786598617344,7.20918305574408
2022-08-24,7.815024376572454,7.2746554292102275
2022-08-25,7.996465964634824,7.380414824619747
2022-08-26,7.999537505296901,7.427086900976117
2022-08-29,8.0358882448838,7.4839740684559946
2022-08-30,8.050171836746241,7.532511648064602
2022-08-31,7.994742560817341,7.555040341433402
2022-09-01,7.85771548858695,7.545086624758062
2022-09-02,7.781394320719562,7.5506794131896955
2022-09-05,7.777590423025671,7.578162825949104
2022-09-06,7.792820425838377,7.610991933315862
2022-09-07,7.786395821103758,7.635360155570746
2022-09-08,7.7523258310955665,7.6484545767067225
2022-09-09,7.681875559627676,7.646312104701214
2022-09-13,7.627453677000876,7.6464509938519845
2022-09-14,7.637802624084145,7.666826610395502
2022-09-15,7.591509561500751,7.666466549859732
2022-09-16,7.5183171945197795,7.654125986321852
2022-09-19,7.552748683730189,7.6768365464883
2022-09-20,7.616374019036397,7.710318974264019
2022-09-21,7.763093406722101,7.774686363457843
2022-09-22,7.854144031047839,7.823276564030235
2022-09-23,7.858980083785707,7.843305959874464
2022-09-26,7.85668959558441,7.860029717760587
2022-09-27,7.830173439976685,7.867160941176485
2022-09-28,7.788329843753792,7.867105887412989
2022-09-29,7.664477558920508,7.835711083408587
2022-09-30,7.57003632295566,7.8099899984655705
2022-10-10,7.4993482697240665,7.789034594896503
2022-10-11,7.476500695357851,7.782299336040413
2022-10-12,7.44776151819768,7.772330340226866
2022-10-13,7.379539547613525,7.747038376833192
2022-10-14,7.411679480558345,7.754910057004996
2022-10-17,7.5338468226691075,7.795625369676329
2022-10-18,7.628103111130127,7.830171863073321
2022-10-19,7.821468434690008,7.9027049606445745
2022-10-20,7.9021011060422905,7.9410594064395115
2022-10-21,7.948949155779263,7.969467788107452
2022-10-24,7.926718655398151,7.974222344794814
2022-10-25,7.917620956397756,7.982277631666497
2022-10-26,7.85459430523056,7.970257030503815
2022-10-27,7.796065964431739,7.9572055011382385
2022-10-28,7.730685023646928,7.939312140287358
2022-10-31,7.597883981202701,7.8948928880210145
2022-11-01,7.479850620097993,7.8510544067817705
2022-11-02,7.4781965479002785,7.844549174096757
2022-11-03,7.4425731777075885,7.8258383674122864
2022-11-04,7.544635922944796,7.854863986456015
2022-11-07,7.607280157273261,7.873186674965928
2022-11-08,7.559628111838982,7.854237073246806
2022-11-09,7.50230180605864,7.830152012274686
2022-11-10,7.43857390671411,7.801836853636406
2022-11-11,7.402111169094536,7.781118655669623
2022-11-14,7.342039756493529,7.750867507659667
2022-11-15,7.301645337049226,7.725748529897426
2022-11-16,7.30366582056943,7.7145520354846475
2022-11-17,7.333132331382392,7.713382133524737
2022-11-18,7.29364226579951,7.6888602422975
2022-11-21,7.265545933058878,7.667286433017414
2022-11-22,7.279956454937329,7.660135781086199
2022-11-23,7.271072946044747,7.645426841957766
2022-11-24,7.233042926783067,7.620308990715112
2022-11-25,7.177212975171733,7.5878777958377865
2022-11-28,7.117023713420306,7.55237000208575
2022-11-29,7.02959419336147,7.505562125155038
2022-11-30,6.929729264756741,7.451888255739174
2022-12-01,6.821134806059839,7.392343431106125
2022-12-02,6.6634768949173875,7.312395861024945
2022-12-05,6.559965753189281,7.247244806228737
2022-12-06,6.461536308344376,7.18135397017109
2022-12-07,6.3712433949149245,7.116067376191686
2022-12-08,6.288067169682064,7.051373233986077
2022-12-09,6.2256207161950075,6.99241978008829
2022-12-12,6.1847008690893235,6.940233095826384
2022-12-13,6.187714773212886,6.90352716185729
2022-12-14,6.148660714926615,6.853178474731827
2022-12-15,6.115070787713349,6.804697826039899
2022-12-16,6.084353674618468,6.757361107576917
2022-12-19,6.016176140546526,6.696934189705391
2022-12-20,5.979267309793336,6.646642913739359
2022-12-21,5.933006182489311,6.593106094794797
2022-12-22,5.855109829458222,6.528109026499931
2022-12-23,5.762726557888934,6.4567391713963485
2022-12-26,5.708755430296941,6.397382702086712
2022-12-27,5.662500104260893,6.340438493412916
2022-12-28,5.630145970210878,6.2883813731852545
2022-12-29,5.586154073900449,6.232599497075276
2022-12-30,5.548454094617759,6.179090464899209
2023-01-03,5.55969330346238,6.1432341620600575
2023-01-04,5.553114122462512,6.102893198117212
2023-01-05,5.551056206746407,6.06538756299829
2023-01-06,5.572763389511714,6.037680315994537
2023-01-09,5.589419261212913,6.010268424544916
2023-01-10,5.590723326154594,5.979270878768429
2023-01-11,5.625888573636063,5.961635957950629
2023-01-12,5.682829843582245,5.954134290872274
2023-01-13,5.732953378902525,5.947241025550251
2023-01-16,5.7879256753537955,5.9447942583671916
2023-01-17,5.819701857479633,5.93689950598942
2023-01-18,5.893063295841331,5.945749484207377
2023-01-19,5.958530928642254,5.955043699805302
2023-01-20,6.022475807840813,5.966689222432862
2023-01-30,6.065002334279172,5.973470009150628
2023-01-31,6.123442394839559,5.987872061966523
2023-02-01,6.202723783236252,6.012097285724723
2023-02-02,6.278029193844554,6.037918198049204
2023-02-03,6.378784605305367,6.075566927694278
2023-02-06,6.468620353868025,6.112845336773483
2023-02-07,6.55976825367675,6.153628664012833
2023-02-08,6.682728160289544,6.208697797972555
2023-02-09,6.794786241119613,6.263796122111739
2023-02-10,6.926291506913666,6.329225329808609
2023-02-13,6.985448502206177,6.372859345039345
2023-02-14,7.067475443910876,6.426059713122665
2023-02-15,7.107434228898978,6.466416134097013
2023-02-16,7.107514465781311,6.493251672090917
2023-02-17,7.118668451385386,6.523340761332631
2023-02-20,7.143049211016972,6.55780643093894
2023-02-21,7.1643400440848515,6.591266191803171
2023-02-22,7.1793709523868126,6.6224697292396595
2023-02-23,7.169095836938878,6.644423406987432
2023-02-24,7.196974068175931,6.678855833381425
2023-02-27,7.21419888723233,6.709671166072627
2023-02-28,7.207762071201561,6.731877424721857
2023-03-01,7.30618669960992,6.790391930676998
2023-03-02,7.384160722414856,6.844089169996303
2023-03-03,7.460741174439627,6.898994768865027
2023-03-06,7.501563347870883,6.942781495709038
2023-03-07,7.493424008227345,6.969529808033995
2023-03-08,7.492172312888961,6.997477337185041
2023-03-09,7.614846799807981,7.06848390521139
2023-03-10,7.706243857809192,7.131418580749923
2023-03-13,7.774201595920759,7.187949064820504
2023-03-14,7.7547819520989725,7.214509349365091
2023-03-15,7.816211386955978,7.268021392660509
2023-03-16,7.760409075018461,7.280728551257849
2023-03-17,7.7035694584435905,7.290089127681475
2023-03-20,7.6333350379961935,7.291750995464308
2023-03-21,7.595312439507542,7.301570387501443
2023-03-22,7.5452729660099624,7.304960611132527
2023-03-23,7.481405977808903,7.300945971523626
2023-03-24,7.403987368621107,7.289245153365956
2023-03-27,7.340486082019567,7.279267317133677
2023-03-28,7.278250461177767,7.267063630707153
2023-03-29,7.209996354673002,7.250167826629336
2023-03-30,7.183874545450981,7.24558439064401
2023-03-31,7.150574156990768,7.237237903617001
2023-04-03,7.020452304695756,7.193066155980483
2023-04-04,6.890620563432078,7.144494772442013
2023-04-06,6.815718656742925,7.111101876664756
2023-04-07,6.7828332532468805,7.090224403483543
2023-04-10,6.771670070310238,7.076100409461039
2023-04-11,6.746553087722099,7.056796452237125
2023-04-12,6.747520337007346,7.046115382388862
2023-04-13,6.769105587900644,7.042996525718245
2023-04-14,6.8156267970182824,7.049653680737517
2023-04-17,6.8943833714023945,7.0694803246233375
2023-04-18,6.9644368631644245,7.088931715665544
2023-04-19,7.015937006188086,7.104151969725007
2023-04-20,7.0422585563168605,7.112118940029249
2023-04-21,7.028682695480625,7.106734513227033
2023-04-24,6.986198304224834,7.090585594186068
2023-04-25,6.935219486854676,7.070005983984957
2023-04-26,6.886094246450945,7.048442520656278
2023-04-27,6.8314035689644355,7.023369640804153
2023-04-28,6.786530669081245,7.000125305053424
2023-05-04,6.693956429774767,6.958632686410989
2023-05-05,6.576779273065611,6.905595777988532
2023-05-08,6.483971856593349,6.857715138017953
2023-05-09,6.403247673434934,6.811527723804124
2023-05-10,6.300403181793376,6.755353442757751
2023-05-11,6.225826142768942,6.7064622613297855
2023-05-12,6.141232909982329,6.652257463803297
2023-05-15,6.098912981012041,6.611070704855455
2023-05-16,6.054937592616752,6.568733862416093
2023-05-17,6.013180527806852,6.526602853552596
2023-05-18,5.966089773821362,6.482097491212351
2023-05-19,5.918053217621707,6.436633487914516
2023-05-22,5.910947980300703,6.405102520585461
2023-05-23,5.87918203337534,6.3655487158677015
2023-05-24,5.844297146813985,6.32482068870135
2023-05-25,5.79946578029266,6.280404256204474
2023-05-26,5.756966944838307,6.236358242082884
2023-05-29,5.736445522211607,6.199768720952651
2023-05-30,5.71849990847672,6.164475198260326
2023-05-31,5.688222434117989,6.125261370449245

Answer: 2.0