skysight-inc/HackerNews huggingface dataset:
And the mistake is here :

> Minitab calculates predicted R-squared by systematically removing each observation from the data set, estimating the regression equation, and determining how well the model predicts the removed observation. Like adjusted R-squared, predicted R-squared can be negative and it is always lower than R-squared.

(linked from the article, and better explained than anywhere in the article).

The mistake is in what is compared against what. Ideally a model would be independent from the data entirely. This is what you get if you correctly derive a model from first principles, and then verify that observed data points agree. The independence is perfect and it is valid to compare the two data sets. Any agreement builds confidence that the model is correct.

However that's not what's being done here. The "model" is a linear combination of the data set. So you're calculating the model generated from n data points with the model generated from n-1 data points, for each point. So you're effectively comparing the data against itself (which is also what R-squared is doing of course).

The correct way to go about this is to randomly divide your dataset in 2 pieces, ideally both should have a decent size. The second part you give to your colleague, with strict instructions to shoot you if you even ask to see that data. You build your model with your data points, and then ask your colleague to compare it with his data, and report only if they're close or not, NOT the values. If your fit is not close to his fit ("too much" - some fuziness here), you're overfitting.

The key difference here is the random part. The "adjusted predictive R squared" does not create independence between the compared data sets. This means it can't work correctly.

I realize this is the typical mathematician argument. I'm claiming here that there exists a way to make R squared and predictive R squared both be way too high, without giving any method to do so. But this is obviously wrong nonetheless.
How to "open" a microchip and what's inside
How Bots Manipulated The Price Of Bitcoin Through At Mt. Gox
awesome, yujiang! it's been cool to see all the hardware stuff you've been hacking over the past few months, sad i missed this your party (and the bar mixvah)!
Seems pretty solid! I tested on iPhone 4, which I use for my subjective performance testing when comparing libraries.

Transitions worked nicely, both meme and YouTube video thumbnail views were smooth. Compared to a possible native implementation the image search didn't work that smoothly during image loading, but it was still usable after all images were loaded. Also the list view for long lists with presumably dynamic loading (UITableView style) wasn't that smooth during scrolling.

All in all, kudos for the good work!
rather high GI for soylent thanks to the maltodextrin

That's certainly a concern, although I think the GI has dropped since the initial version thanks to the introduction of oat flour.

But for the purpose of figuring out how all the variables interact, it doesn't really matter if Soylent is good T1D food or bad T1D food... as long as it's consistent. I certainly wouldn't switch to Soylent long-term without seeing how it affects my A1Cs, but as a short-term experiment it might be worth having worse numbers in order to learn how to get better numbers.
The site says "you should own your own identity and content." Well, that's great in theory, but where should I put my identity and content? Should I store it on a flash drive? That seems a bit risky. Should I have a bunch of flash drives in security deposit boxes? That seems like a huge pain in the ass. How about a site where I can upload all of it! Well, now we're back to the same problem - but instead of it being on many sites, it's just on one.

I think the real answer is decentralization. Maintaining your data in many different places on the web and trusting that it's very unlikely that all of these sites will go down. Security and privacy, of course, is an entirely different matter.
I'm a big Sir Arthur Conan Doyle fan, but I'm always bothered whenever this quote surfaces:

> Once you have eliminated the impossible,” the fictional detective Sherlock Holmes famously opined, “whatever remains, however improbable, must be the truth.

This is terrible advice, even more so when mentioned in a scientific publication. This recommendation is the antithesis of what the scientific method is about and a text book example of an argument from ignorance.

You don't pick an explanation because you have run out of ideas to explain a phenomenon, for the simple reason that there might be other explanations you have not considered.

The time to believe something is when there is evidence to back it up.
Other people. Like said company's competition? Like said company's clients?

If I go to a restaurant and order a meal, and the waiter decides that's a good opportunity to invite his friends to eat from my plate, I'd find this a good opportunity to walk out without paying a dime.
The obvious crazy-sci-fi use of this is transplanting an older head/brain into a younger, cloned body.

While this would only happen many years in the future, if at all, to say this raises ethical issues is a serious understatement.
Sure thing, shoot me an e-mail at support@freshpost.io and I'll get you one
13 Personality Traits of a Disengaged Employee [Infographic]
Former tennis player here, and builder of a similar device for weightlifting form. Unlike a lot of other wearable kickstarter projects, I think most of the technological claims here are legit. That said, I'm not sure if it does enough to be useful for an avid tennis player. To improve my game, I would like to see:

1) Swing form correction

2) The angle of the racket relative to an incoming ball (to predict air or ground balls)

3) Stance information.

Form correction would require position data during the entire swing. Position information is two integrals away from acceleration data collected from the sensors, so it's far too noisy to determine that well enough.

I don't know how would you would measure stance with a bracelet, and I'd imagine that racket angle is unreliable.

I also question the ball speed measurement for a similar reason to form correction. I'd imagine a possibly effective way to measure speed would be to correlate acceleration data with externally measured velocity data collected in real-life trials. That said, unless you're competing at an advanced level, speed is a vanity metric so I don't care if its a ballpark estimate.

Video recording, however inconvenient it may be, addresses all these well. I'd rather see a camera added to tennis courts to record your performance, but that's far less sexy of a product to build.

That said, the bracelet looks sexy and the goal of personal training sure beats the hell out of fitbit/fuel/jawbone's capabilities.
Ah, that's great. For those wondering how: https://en.wikipedia.org/wiki/File:Peristaltic_pump.gif
People keep going on and on about the nutritional value of the drink overall, but I'm somewhat curious to the effects it might have on the digestive tract.

For example, if you ate soylent for a full year, and then went straight back to regular food, would your body have trouble digesting solid food now that it hasn't had to do so for a long period of time? What if we extend this time period to 5 years, or 10? I think we can maybe pull some insight from astronauts in this regard, as we should have some information about the change from tube-food to solid food from extended space missions.

I can see soylent being a fantastic replacement in some respects, particularly with regards to coeliac's disease or with dairy allergies, but I'm still partially skeptical about the kinds of change that soylent will introduce in the future. One of the great parts about food nowadays is that you can basically grow and manufacture it anywhere, with the obvious caveat that not all food is available everywhere at once. On the other hand, with soylent, our food is almost "centralized" in a sense, since it is likely more difficult to create soylent than it is to throw seeds in the ground, or hunt and scavenge. This is sort of the reason why I'm curious to how the human body will react to such an abrupt change in diet. If humans just eat liquid food for an extended period of time, or their whole life, will they eventually lose / have difficulties with eating solid, more traditional food? Should a crisis arise (something akin to great floods or an earthquake), will it be possible to produce / ship enough soylent fast enough to fulfill the dietary needs of the population in need of aid?

Of course, these sorts of questions assume that soylent will become a dietary replacement, rather than an occasional meal replacement, but I get the feeling, at least from this article, that replacing the diet is the plan of Rhinehart et al. I won't personally test soylent out, I love fancy food and flavours too much to bother, but in some sense I will follow the product and see what happens with it. I don't think something on this scale has ever been attempted before with regards to dietary / meal replacements, so it should be interesting (not necessarily good or bad, just interesting) to see what kinds of disasters / utopias unfold thanks to a full dietary replacement.
Yes, but the visualizations I programmed started with http://polygeek.com/images/chaos/fig_01_BifurcationGraph.png
Aside from "know someone who knows someone" hacks, I don't think so -- the 12 week delay is due to production constraints, not shipping constraints.
The brave new world of DIY faecal transplant
Anyone know a really easy way to get a list of all apps that I've purchased on both App store and Google play (and how much)?
Personally, I can't agree enough with this. Positioning the wearable as a "iBracelet" means that it can be work at the same time as a consumer's watch; whereas an "iWatch" potentially limits the market.

That said, I can completely understand the position of making an iWatch and forcing the choice between existing watches and Apple's. However, to me it's better to competing with fitbit than rolex.
Greg, if you know anybody that has some pull on these kinds of things within IBM, can you contact The FreeBSD Foundation? We might need some kind of "FreeBSD and derivative" exemption or an interpretation of the unexpired patents effects on an RCU implementation. Justin Gibbs said last time he tried to contact IBM he got directed immediately to legal staff and does not have a good contact within IBM.
Wondering what this is about? These are the long awaited satellite communication logs from flight MH370 with Inmarsat. Basically, the raw data that indicated the likely crash in the Indian Ocean off Australia, and thus gave an area to search. CNN has some info @ http://www.cnn.com/2014/05/27/world/asia/malaysia-missing-pl...

There have been all sorts of theories about the math and data. So we finally have the data and others can peak into it. Although, I suspect we are going to see some crazy new theories now. Here are just some of the links I found while researching the topic and what to do with this raw data:

http://www.duncansteel.com/

http://www.reddit.com/r/MH370/comments/218i36/how_the_satell...

http://physicsbuzz.physicscentral.com/2014/03/how-did-inmars...

http://aviation.stackexchange.com/questions/2623/how-did-the...
Thanks for your comments guys, but if this is true, why don't I see more workers in their 40s, 50s, and 60s around? (and I'm not specifically speaking of devs, although the effect seems more drastic there).

And I don't work at a startup - this is the 2nd large company (>20k employees) I've worked at, and in both cases, I would say that the percentage of workers over 50 is less than 10% - and most are managers or senior folks.

My question is simple - where the heck did all these people go? I don't think the mortality rate is that high ;-) and I doubt many people can afford to retire that early.
Very sound.

One formal model of complex numbers is R[i]/(i^2 + 1), which means all real polynomials in the variable i (R[i]) after "simplifying" (/) by taking i^2 + 1 = 0 (equivalently i^2 = -1)... which is exactly the process you are describing.
Why are you cancelling CC?
Playsight does this:

http://www.usatoday.com/story/sports/tennis/2013/11/28/play-...
https://play.google.com/store/account should give you your purchase history.
"The explicitly stated purpose of Soylent is NOT to live on."

That's an odd thing to say considering Rhinehart initially got all this attention because he was LIVING OFF OF IT. It's almost like he was trying to make a statement. Hmm...
Founder of ContentDJ (http://a.contentdj.com/1nrbICq) here.

I am curious to see how you guys decided to go after this space. For me, I started ContentDJ through an attempt at growth hacking on Twitter. Through a script I developed back in 2011, I was able to retweet trending content and grow my followers by about 1K per month. It turned into a viable growth channel for the startup I was working on at the time. So, I made the pivot and build ContentDJ (http://a.contentdj.com/1nrbICq).

As an interesting anecdote, last year, two product managers from Buddy Media signed up. Through Mixpanel, I found that they were particularly interested in my social media editorial calendar feature (http://a.contentdj.com/1lOiRWD). Surely enough, just last month, Salesforce announced their Marketing Cloud with a very similar content calendar in it. Unfortunately we now live in a world where multi-billion dollar public company steals from a one-man bootstrapped startup...
I foresee a future dominated by wealthy, semi-senile "immortals" in virile, muscular young vat-grown bodies.

At least, I hope they're vat-grown.
In the context of murder investigations, perhaps it is easier to form a complete set of possible explanations before applying that principle? That's how I always read it at least.
Yeah, just as a data point, I look for activity like this (which already exists, all over the place) to decide whether to follow somebody on Twitter. If I see a bunch of what I believe are automated "share stuff and pray" posts, there's no way I'm following.

It's also sad to think that people might believe they're getting ahead at social media somehow by essentially running a robo-link service. But maybe I'm missing some part of the equation with this new offering. Perhaps the robo-links weren't relevant enough in the past, and these are extra relevant robo-links.
That world already exists for organs in some third world nations. If they can actually perfect this concept, you can be absolutely sure there will be a black market for it.

However I would question whether this technology will be perfected sooner than other forms of regenerative and organ growing medicine that will make it mostly pointless.
Longer title tag, please. I just bookmarked the site and found "App.js" in my database with no other context :-( Should help with search bots, too, IIRC~
Probably better to add this as a comment to https://news.ycombinator.com/item?id=7802986 so there aren't two threads.
Largest torrent search engine Torrentz.eu taken down by UK anti-piracy police
Sounds like a good sci-fi plot
It is very sound. You can think of i as being a variable 'x', and therefore, you can see Complex numbers are polynomials over real numbers (denoted as R[x]). But you can simplify the polynomials by using the fact that x2 = 1 for this construction (since x = i on this situation).

This is the exact construction of Complex numbers as an algebraic extension over the field of Real numbers[1]

What is more amazing: there is no such way to do the same on the complex numbers. This is because the Complex numbers form an Algebraically closed field[2]

[1] http://en.wikipedia.org/wiki/Field_extension#Examples

[2] http://en.wikipedia.org/wiki/Algebraically_closed_field
Why can't we start thread twice? (Funny)
> “In principle, everything possible in our universe could be written down in a big book consisting of nothing but tasks [and in] this big book will also be encoded all of the laws of physics.”

This is hardly a grand "Theory of Everything" and a lot more like a messy rule book of exceptions and edge cases, that attempts to cover all rules for classical and quantum systems.
It's not misogny because 'serial killers' - that is a group who are overwhelmingly men, overwhelming same, overwhelmingky kill women and overwhelmingly use sadistic sexual violence and mutilation.

> Its newsworthy because it doesn't happen that often. You are kidding me right? Sexual violence is continuous.
The key word in that quote is "eliminated". Try this more modern translation:

"Once you have falsified every other possible hypothesis, whatever hypothesis remains is the one we'll promote to a theory."

Holmes' is not saying you get to just make things up - he's trying to explain that instead of trying to prove something directly, inverting your perspective and falsifying as many incorrect interpretations ("the impossible") should always work - even if yo don't understand why.

That quote is an incredibly efficient summarization of the scientific method's core philosophy that (because you can't prove a positive), you falsify wrong hypothesis instead.
As a novice player, it's frustrating to read stories about players beating other players "by the book," i.e. they know more openings than the other player does, so they play some unexpected opening and just destroy the opponent out of the gate. I guess this is possible in just about any game, not just chess, but it seems to reduce the optimal learning process for a novice to "start memorizing things". Bah. Edit: Not that memorization is bad or boring by necessity, but finding a way to make the memorization fun and interesting is in itself frustrating, knowing that you could learn openings really fast just by brute-forcing the various lines into your brain with things like memory palace techniques.
Well, I'd like to read the published paper. Anyone who is interested in quantum computing comes to his/hers analogies and beliefs of the underlying laws of the universe. The discussions on digital physics have been around since Zuse.
I can't see why they claim that they have found something groundbreaking.
In my opinion, this theory is closer to philosophy rather than quantum mechanics.
All in favour of removing the scribd autolinks as scribd are a cancer on the internet please upvote. Karma sink for downvoting will go below. If it hasn't appeared yet feel free to go to my history.
...and what script is that?
I use http://ionicframework.com in this area because I like Angular and there are a lot of content on it all over the web.

Most of my friends use http://www.idangero.us/framework7/, which is also good and has many components. (Though I didn't really used it myself)

App.js doesn't look like it has enough components ATM.
For karmasink purposes.
+1 for VCA. This book is written with passion and is one of the truly amazing book on Mathematics. It's just too bad it's so priced heavily (hint: International editions are far more cheaper).
Per `dang's suggestion https://news.ycombinator.com/item?id=7803158, here's the link to the paper so that we may consolidate the threads:

http://arxiv.org/abs/1405.5563

Edited to steal more screenspace/add context:

Authors:

https://web.archive.org/web/20120402224250/http://193.189.74...

http://edge.org/memberbio/chiara_marletto

You may also be interested in this paper:

http://www.cs.berkeley.edu/~christos/classics/Deutsch_quantu...

Also, http://edge.org/conversation/constructor-theory
Tuffmail (has been rock solid IMAP hosting provider for my personal email for over 7 years) | Sanebox (helps keep my email inbox under control) | Sugarsync (solid and reliable file sharing and backup. More flexible than Dropbox - can't understand why more people don't use it) |Mynetfone (good, reliable Australian VOIP provider) | Wordpress.com
Namecheap | Netflix | Getflix | Spotify
Plenty of people die from traumatic head injuries leaving otherwise healthy bodies. There's lots of potential donors.

Even with new bodies, however, aging takes quite the toll on the brain. Fixing that would likely fix the need for body transplants, and not fixing it would make more than a single transplant a depressing prospect.

The clearest use for this technique, were it ever viable, would be just what the article stated: the treatment of otherwise terminal illnesses (or, for that matter, massive body trauma).
Commercial GPS Turns 25: How Unwanted Military Tech Found Its True Calling
Oh for christ's sake, this is obviously pointless. You win. I give. Uncle. Whatever.

Also, you're wrong. And if you think misogyny (or whatever cause du jour we're using today) creates serial killers, and not mental illness then you're more than welcome to believe that. Plenty of psychologists say you're entirely incorrect[0], and I'll defer to them on this, but this "discussion" is utterly pointless, as you cherry pick whichever sentence you feel like pulling apart and ignoring the rest of it -- which are facts for the most part, not my opinion.

[0] http://time.com/114354/elliot-rodger-ucsb-misogyny/

Ps. You know, I'm not even arguing that cultural misogyny isn't a problem. I think it is, and am a big believer that we have a problem in our tech industry that we need to fix. What I'm arguing is that you're currently no better than those who blame video games for shootings, ignoring the real cause, which is broken, sick people.

EDIT:

Oh and you're wrong. Victims are not "overwhelmingly" women, nor is it "overwhelmingly" because of sadistic motives. See [1]:

Characteristics of U.S. Serial Killer Victims

Sex N%
Male
3,854 44.54%

Female
4,799 55.46%

[1] http://maamodt.asp.radford.edu/Serial%20Killer%20Information...
Good point. It could be the libraries which are used by a lot of people like boto. There could be many more.
Name and logo immediately made me think of Freshbooks.
Make it work cross-platform, but offer better support (and more importantly support contracts) on Windows. This positions Microsoft as a credible player in the modern software world, but still positions Windows as the premiere environment for running Microsoft-stack applications.
i don't know much about opening but i play chess frequent in my younger age and sometimes computer. It's just a pattern.But to win with computer,must follow non pattern/opening to win.. Very long time not playing chessmaster software.
Stephen Hawking: "Human Evolution is About to Mimic Evolution's Big Bang"
apropos is often an alias, shell function, or script wrapper around 'man -k'.

Actually, on my Debian system, it's a symlink to whatis(1).
If you mean this [1], then they convinced the USPTO that their process for taking pictures with a white background and making it look good (F-stops, ISO settings, etc.) was patentable. And of course, the patent says "It should be emphasized that the above-described embodiments of the present disclosure are merely possible examples of implementations set forth for a clear understanding of the principles of the disclosure."

Because you could, of course, use other F-stops, ISO settings, etc. That would be really obvious. The whole set it up with good settings a normal photographer might use? That's the original part.

This reminds me of Apple's design patent on a design where "rounded corners" were basically the only feature anyone could name that was similar to Samsung's. So technically they didn't patent rounded corners... they just accused Samsung in court of infringing it with a phone where that was the primary similarity.

This is all part of a big game where patent lawyers find meaningless "limitations" like this to distinguish themselves from the prior art to the USPTO, then come back to the federal courts and demonstrate just how meaningless they are as they assert what might as well be as bad a patent as is the popular understanding.

[1] http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=H...