1189 search results for "Tutorial"

More, Please!

March 17, 2011
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Thanks to Jim, I’ve been using R in the shell more and more – in concert with vi. It’s been fun, and nice to integrate my workflows all on the server (although I haven’t had to do much graphing yet – I’m sure I’ll start kvetching then and return to a nice gui). One thing

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Global Migration Maps

March 17, 2011
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Global Migration Maps

 Migrations of people have existed for millennia and oc

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sab-R-metrics: Brief Sidetrack for Scatterplot Matrices

March 16, 2011
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sab-R-metrics: Brief Sidetrack for Scatterplot Matrices

In my last two posts I talked about Ordinary Least Squares, then extended this discussion to the multiple predictor case and briefly talked about some of the problems that may arise. These problems can include omitted variable bias, heteroskedasticity, non-normality, and multicollinearity. Most of these problems are relatively minor in practice and have easy fixes,...

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sab-R-metrics: Brief Sidetrack for Scatterplot Matrices

March 16, 2011
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sab-R-metrics: Brief Sidetrack for Scatterplot Matrices

In my last two posts I talked about Ordinary Least Squares, then extended this discussion to the multiple predictor case and briefly talked about some of the problems that may arise. These problems can include omitted variable bias, heteroskedasticity, non-normality, and multicollinearity. Most of these problems are relatively minor in practice and have easy fixes,...

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Visualizing Growth of a Retail Chain

March 15, 2011
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Visualizing Growth of a Retail Chain

I am a regular reader of the FlowingData blog by Nathan Yau. It is an excellent reference for anyone interested in statistical visualization of data. One of his posts that caught my attention was a visualization of the growth of Walmart in the US. Given my research interests in retail, it was a fascinating insight

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Happy Pi Day, Now Go Estimate It!

March 14, 2011
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Happy Pi Day, Now Go Estimate It!

As you may know, today is Pi Day, when all good nerds take a moment to thank the geeks of antiquity for their painstaking work in estimating this marvelous mathematical constant. It is also a great opportunity to thank contemporary geeks for the wonders of modern computing, which allow us to estimate pi to near

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R/Finance 2011 Registration Open

March 14, 2011
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The registration for R/Finance 2011--which will take place April 29 and 30 in Chicago--is NOW OPEN!Building on the success of the two previous conferences in 2009 and 2010, we are expecting more than 250 attendees from around the world representing bot...

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R/Finance 2011 Registration Open

March 14, 2011
By

The registration for R/Finance 2011--which will take place April 29 and 30 in Chicago--is NOW OPEN!Building on the success of the two previous conferences in 2009 and 2010, we are expecting more than 250 attendees from around the world representing bot...

Read more »

sab-R-metrics: Multiple Regression and Interactions

March 12, 2011
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Last time, I covered ordinary least squares with a single variable. This time, I'll extend this to using multiple predictor variables in a regression, interacting terms in R, and start thinking about using polynomials of certain terms in the regression (like Age and Age Squared). This should be a pretty straight forward tutorial, especially if you've got...

Read more »

sab-R-metrics: Multiple Regression and Interactions

March 12, 2011
By

Last time, I covered ordinary least squares with a single variable. This time, I'll extend this to using multiple predictor variables in a regression, interacting terms in R, and start thinking about using polynomials of certain terms in the regression (like Age and Age Squared). This should be a pretty straight forward tutorial, especially if you've got...

Read more »