Monthly Archives: June 2009

A start

June 24, 2009
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I've decided that this summer I will finally break down and force myself to learn a little bit about using R. I currently use Stata, a very good program, but the idea of R is appealing since it's free under the GNU license. It has a large and active us...

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A start

June 24, 2009
By

I've decided that this summer I will finally break down and force myself to learn a little bit about using R. I currently use Stata, a very good program, but the idea of R is appealing since it's free under the GNU license. It has a large and active us...

Read more »

Weekly R Clinic

June 24, 2009
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For readers at Vanderbilt: At yesterday's R course I found out that Theresa Scott in the Biostatistics department holds a weekly R clinic and encourages new R users who want to learn more to bring any questions about R, or even your own code and data. The R clinic is held weekly on Thursday from 2:00-3:00 in MCN....

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Example 7.3: Simple jittered scatterplot with smoother for dichotomous outcomes with continuous predictors

June 24, 2009
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Example 7.3: Simple jittered scatterplot with smoother for dichotomous outcomes with continuous predictors

It's useful to look at scatterplots even when the "y" variable is dichotomous. For example, this can help determine whether categorization or linear assumptions would be more plausible. However, an unmodified scatterplot is less than helpful, since all of the "y" values are either 0 or 1, and are hard to separate visually. Some jittering...

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Book now discounted 33% at Amazon!

June 24, 2009
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Book now discounted 33% at Amazon!

Our book, SAS and R: Data Management, Statistical Analysis, and Graphics, is discounted by a full third at Amazon. With free shipping! Also, they claim if it is further discounted before it ships, they'll give you the reduced price.

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PDF tutorial from R course (Introduction to R)

June 23, 2009
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Writing from the previously mentioned intro to R course at the Kennedy Center. If you couldn't make it you can download all the course materials from Theresa Scott's website, under the "Current Teaching Material" heading. Here is a direct link to the PDF for the overview materials that we're going over today, along with the R code...

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I had been wondering what impact my friending 200 people from my…

June 22, 2009
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I had been wondering what impact my friending 200 people from my…

I had been wondering what impact my friending 200 people from my Gmail address book had, so I scraped the dates from the notification emails. The plot shows notifications of friend requests from other people to me in black and confirmations of my requests to other people in red. That sudden and sharp increase at...

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Who’s Tweets Do I Read… Magic R Code Says…

June 22, 2009
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Who’s Tweets Do I Read… Magic R Code Says…

So one glace at my user logs shows the truth: no one gives a rat’s rump that I just quit my job; you just love you some Twitter R code. And I’m nothing but an attention whore, so come get some! So in my last ‘Twitter with R’ post I gave you some code I’d written

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Parallel computing in R: snowfall/snow

June 20, 2009
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I finally have time to try parallel computing in R using snowfall/snow thanks to this article in the 1st issue of R journal, which replaces R news. I didn’t try it before because i didn’t have a good toy example, and it seemed like a steep learning curve (i only guessed what parallel computing was).

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Network Analysis Software: focus on F/OSS

June 20, 2009
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Network Analysis Software: focus on F/OSS

What do you use for network analysis? I found the Wikipedia list of network software entirely overwhelming. I wanted to test out some of the introductory tools, but avoid the trap of sinking my time into a dead-end software project. (Remember learning Minitab in freshman statistics? How often do you use Minitab today for anything

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