Monthly Archives:April 2010

Quick and dirty parallel processing in R

April 30,2010
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Quick and dirty parallel processing in R

R has some powerful tools for parallel processing,这是我在寻找充分利用我的8核计算机工作的方法时发现的。What surprised me is how easy it is…金宝搏网址about 6 lines of code,if that.Given that I wasn't allowed to install heavy duty parallel-processing systems like MPICH on the computer,I found

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How many girls,how many boys?

April 30,2010
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How many girls,how many boys?

I found this interesting question over here at mathoverflow.net.问题是:如果你有一个国家,在这个国家,每个家庭都会继续有孩子,直到他们有了一个男孩,then they will stop.这个国家男女比例是多少?首先,there are some assumptions you need to make that aren't

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Which font uses the most ink?

April 30,2010
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Which font uses the most ink?

If you're being particularly cost-conscious 金宝搏网址about your use of printer ink or toner,you may be wondering which font you should choose to minimize ink use.Here's an infographic with the answer: This is an interesting infographic in its own right,but what makes it cool is that these are not photoshopped images of Bic biros.马特·罗宾逊创造了…

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使用R-Spector进行数据操作(2008年)

April 30,2010
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使用R-Spector进行数据操作(2008年)

Title: Data Manipulation with RAuthor(s): Phil SpectorPublisher/Date: Springer/2008Statistics level: N/A Programming level: Intermediate Overall recommendation: Highly recommended If there is one book that every beginning R user coming from a programming background should have,it is Spector's Data Manipulation with R.New R users with analytic backgrounds and experience with software packages such as SAS The post Data Manipulation...

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使用R-Spector进行数据操作(2008年)

April 30,2010
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Title: Data Manipulation with RAuthor(s): Phil SpectorPublisher/Date: Springer/2008Statistics level: N/A Programming level: Intermediate Overall recommendation: Highly recommended If there is one book that every beginning R user coming from a program...

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hash-2.0.0

April 30,2010
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hash-2.0.0

Come see my talk on hashes in R at useR!2010.(http://user2010.org/)July 20-23National Institute of Standards and Technology (NIST),Gaithersburg,Maryland,美国

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5分钟R分析:Case-Shiller指数

April 29,2010
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5分钟R分析:Case-Shiller指数

The Case-Shiller Home Price Indices measure residential home values for 20 cities in the US,一些指数一直追溯到80年代。With housing prices all the rage these days,我们应该使用r执行一个快速而肮脏的分析,看看我们可以从这个丰富的数据集中收集到什么。First things

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Research in pair next summer

April 29,2010
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Research in pair next summer

今天我收到了一个好消息,我们与Jean-Michel Marin提出在CIRM进行“成对研究”的建议,发光a fortnight next summer was accepted!This research centre in Mathematics is a southern and French version of the renowned German centre of Oberwolfach and,我更喜欢凉爽的黑森林

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Getting a Web application to talk to R

April 29,2010
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Let's face it: you can do some pretty awesome things with R -- statistical models,beautiful charts,you name it -- but if the only way to do those things is from the R command line you're limiting the audience of people who might make use of all this awesomeness to a limited subset: R programmers.What if you...

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Response to Flowingdata Challenge: Graphing obesity trends

April 29,2010
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Response to Flowingdata Challenge: Graphing obesity trends

Nathan at Flowingata put up another interesting challenge today to improve the following graphic showing obesity trends in America.Here's my attempt: I transposed the data so that the cohorts are on the X axis and each separate line represents an age group.So each line shows the percentage of obese people in a particular

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