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It is quite common in political science for researchers to run statistical models, find that a coefficient for a variable is not statistically significant, and then claim that the variable "has no effect." This is equivalent to proposing a research &#8... [Read more...]

I just returned from the useR! 2012 conference for developers and users of R. One of the common themes to many of the presentations was integration of R-based statistical systems with other systems, be they other programming languages, web systems, or enterprise data systems. Some highlights for me were an update ... [Read more...]

The second round of group games ended last night (sadly with Sweden’s elimination). Here is what the last number of days has done to the plots. [Read more...]

Yet another full day working on Bayesian Core with Jean-Michel in Carnon… This morning, I ran along the canal for about an hour and at last saw some pink flamingos close enough to take pictures (if only to convince my daughter that there were flamingos in the area!). Then I ... [Read more...]

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Just finish my last assignment for this week. IT’S WEEKEND, officially. Let me take a break to have a look at the tenth problem, another prime problem. It’s no doubt that prime is the center of the number theory and fundamental … Continue reading → [Read more...]

Recently British government (by Office  of National Statistics: ONS) just published their version of R manual for analysis of the government survey. The links to PDF and MS word versions of the manual including the R syntax are as below. Note: The R syntax link is not working now. I ... [Read more...]

Last week, Joe Rickert used R and four years of US Census data to create an image plot of the relative probabilities of being born on a given day of the year: Chris Mulligan also tackled this problem with R, but this time using 20 years of Census data from 1969 to 1988. ... [Read more...]

Where do these come from? Since most statistical packages calculate these estimates automatically, it is not unreasonable to think that many researchers using applied econometrics are unfamiliar with the exact details of their computation. For the purposes of illustration, I am going to estimate different standard errors from a basic ... [Read more...]

Just a quick note that I’ve posted the slides, code, and dataset from my useR 2012 talk. I’m having a great time here in Nashville and will write up a conference review soon, with links to the many excellent packages … Continue reading → [Read more...]

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The most recent edition of the Revolution Newsletter is out. The news section is below, and you can read the full June edition (with highlights from this blog and community events) online. You can subscribe to the Revolution Newsletter to get it monthly via email. Revolution R Enterprise 6 Now Available! ... [Read more...]

In case you missed them, here are some articles from May of particular interest to R users. R tops the annual KDNuggets Data Mining Software poll for the first time. R 2.15.1 is scheduled for June 22. (Revolution R Enterprise 6, released on June 5, is based on 2.14.2.) A tutorial uses R, Hadoop, and ... [Read more...]

Just had supper. My stomach is full of cabbage, carrot and noodle. I’d like to solve the ninth problem to stretch my mind. This one is about Pythagorean theorem. A Pythagorean triplet is a set of three natural numbers, a __ b __ … Continue reading → [Read more...]

Now that every team has played a match it will be interesting to see how this has affected the (inverse) odds of victory. Since the plot in my last post was a bit ‘busy’, I have decided to use the facet_wrap function in gglplot2 to stratify by group. Also, ... [Read more...]

Here is a little overview on GenABEL library developed by Yurii Aulchenko (www.genabel.org/). GenABEL is a full-featured R library for dealing with Genome-Wide Association analysis of binary and quantitative traits. Compared to the ‘genetics’ package and many other tools, GenABEL … Continue reading → [Read more...]

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