Blog Archives

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
By
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,...

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...

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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 »

sab-R-metrics: Basic Applied Regression (OLS)

February 23, 2011
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sab-R-metrics: Basic Applied Regression (OLS)

Today, I'll again be using a new data set that can be found here at my website (called 'leagueoutcomes.csv'). The data set includes the standings results of the 2009 season for MLB along with average game attendance by team. I'll use this to go over some basic regression techniques and tools in R. Hopefully this...

Read more »

sab-R-metrics: Basic Applied Regression (OLS)

February 23, 2011
By
sab-R-metrics: Basic Applied Regression (OLS)

Today, I'll again be using a new data set that can be found here at my website (called 'leagueoutcomes.csv'). The data set includes the standings results of the 2009 season for MLB along with average game attendance by team. I'll use this to go over some basic regression techniques and tools in R. Hopefully this...

Read more »

sab-R-metrics: Displaying Line Plots and Time Series Data

February 13, 2011
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sab-R-metrics: Displaying Line Plots and Time Series Data

It's been a while since I've had the chance to add anything here, but last time I left everyone with some scatter plots and some customization tools for your graphics. This week will be a little more brief than the last few tutorials and what I'd like to do is show you how to display line graphs for...

Read more »

sab-R-metrics: Displaying Line Plots and Time Series Data

February 13, 2011
By
sab-R-metrics: Displaying Line Plots and Time Series Data

It's been a while since I've had the chance to add anything here, but last time I left everyone with some scatter plots and some customization tools for your graphics. This week will be a little more brief than the last few tutorials and what I'd like to do is show you how to display line graphs for...

Read more »

Fixing Up smoothScatter Heat Maps

February 2, 2011
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Fixing Up smoothScatter Heat Maps

A while back, I posted an article using the smoothScatter function in R that builds a color representation of density for scatter plots. When I first found the function, I was extremely excited because it's a very easy and automated way to make a heat...

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Fixing Up smoothScatter Heat Maps

February 2, 2011
By
Fixing Up smoothScatter Heat Maps

A while back, I posted an article using the smoothScatter function in R that builds a color representation of density for scatter plots. When I first found the function, I was extremely excited because it's a very easy and automated way to make a heat...

Read more »