2691 search results for "Twitter"

I Work For The Internet !

December 13, 2011
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I Work For The Internet !

UPDATE: code and figure updated at 647 AM CST on 19 Dec '11.  Also, see Jarrett Byrnes (improved) fork of my gist  here.The site I WORK FOR THE INTERNET is collecting pictures and first names (last name initials only) to show collective suppo...

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I Work For The Internet !

December 13, 2011
By
I Work For The Internet !

UPDATE: code and figure updated at 647 AM CST on 19 Dec '11.  Also, see Jarrett Byrnes (improved) fork of my gist  here.The site I WORK FOR THE INTERNET is collecting pictures and first names (last name initials only) to show collective suppo...

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A prize of US$3,000,000 for a data mining competition to improve healthcare

December 13, 2011
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A prize of US$3,000,000 for a data mining competition to improve healthcare

There is a data mining competition with a prize of $3,000,000. The target is to improve healthcare in US by identifying patients who will be admitted to a hospital within the next year, using historical claims data. The algorithm to … Continue reading →

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Backtesting Minimum Variance portfolios

December 12, 2011
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Backtesting Minimum Variance portfolios

I want to show how to combine various risk measures I discussed while writing the series of posts about Asset Allocation with backtesting library in the Systematic Investor Toolbox. I will use Minimum Variance portfolio as an example for this post. I recommend reading a good discussion about Minimum Variance portfolios at Minimum Variance Sector

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How to Become an Efficient and Collaborative R Programmer

December 12, 2011
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I may want to add a subtitle “Why R-Forge Must Die” (thinking of Barry Rowlingson’s talk earlier this year). I have been a GitHub user for two years, and I was mainly influenced by Hadley. Now I even feel a little bit addicted to GitHub (its slogan is “social coding”), because it is really convenient

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Exploring Your Voter File with R

December 12, 2011
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Exploring Your Voter File with R

We perform a voter file analysis for Wake County, NC using R.

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How to Become an Efficient and Collaborative R Programmer

December 12, 2011
By

I may want to add a subtitle "Why R-Forge Must Die" (thinking of Barry Rowlingson's talk earlier this year). I have been a GitHub user for two years, and I was mainly influenced by Hadley. Now I even feel a little bit addicted to GitHub (its slogan is ...

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UseR! 2011 slides and videos – on one page

December 11, 2011
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Links to slides and talks from useR 2011 - all organized in one page.Read more »

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Rescuing Twapperkeeper Archives Before They Vanish, Redux

December 11, 2011
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Rescuing Twapperkeeper Archives Before They Vanish, Redux

In Rescuing Twapperkeeper Archives Before They Vanish, I described a routine for grabbing Twapperkeeper archives, parsing them, and saving them to a local desktop file using the R programming language (downloading RStudio is the easiest way I know of getting R…). Following a post fron @briankelly (Responding to the Forthcoming Demise of TwapperKeeper), where Brian

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Rescuing Twapperkeeper Archives Before They Vanish

December 10, 2011
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Rescuing Twapperkeeper Archives Before They Vanish

A couple of years or so ago, various JISC folk picked up on the idea that there might be value in them thar tweets and started encouraging the use of Twapperkeeper for archiving hashtagged tweets around events, supporting the development of that service in exchange for an open source version of the code. Since then,

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