Posts Tagged ‘ ifelse() ’

Example 9.32: Multiple testing simulation

May 21, 2012
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In examples 9.30 and 9.31 we explored corrections for multiple testing and then extracting p-values adjusted by the Benjamini and Hochberg (or FDR) procedure. In this post we'll develop a simulation to explore the impact of "strong" and "weak" control...
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Example 9.29: the perils of for loops

April 30, 2012
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A recent exchange on the R-sig-teaching list featured a discussion of how best to teach new students R. The initial post included an exercise to write a function, that given a n, will draw n rows of a triangle made up of "*", noting that for a beginne...
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Example 8.40: Side-by-side histograms

June 13, 2011
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Example 8.40: Side-by-side histograms

It's often useful to compare histograms for some key variable, stratified by levels of some other variable. There are several ways to display something like this. The simplest may be to plot the two histograms in separate panels.SASIn SAS, the most d...
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Example 8.40: Side-by-side histograms

June 13, 2011
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Example 8.40: Side-by-side histograms

It's often useful to compare histograms for some key variable, stratified by levels of some other variable. There are several ways to display something like this. The simplest may be to plot the two histograms in separate panels.SASIn SAS, the most d...
Read more »

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Posted in SAS | Comments Off

Example 8.40: Side-by-side histograms

June 13, 2011
By
Example 8.40: Side-by-side histograms

It's often useful to compare histograms for some key variable, stratified by levels of some other variable. There are several ways to display something like this. The simplest may be to plot the two histograms in separate panels.SASIn SAS, the most d...
Read more »

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Posted in SAS | Comments Off

Example 8.21: latent class analysis

January 18, 2011
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Latent class analysis is a technique used to classify observations based on patterns of categorical responses. Collins and Lanza's book,"Latent Class and Latent Transition Analysis," provides a readable introduction, while the UCLA ATS center has an o...
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