Articles by Nick Horton

another look at CRAN Task Views

May 26, 2011 | Nick Horton

We've been impressed with how helpful the CRAN Task Views are in guiding us in R as we wend our way through the huge number of add-on packages (3021 as of May, 2011). These are web pages that are maintained by volunteers with expertise in a specified ...
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Example 8.24: MplusAutomation and Mplus

February 7, 2011 | Nick Horton

In recent entries (here, here, and here), we've been fitting a series of latent class models using SAS and R. One of the most commonly used and powerful software package for latent class model estimation is Mplus. This commercial software includes su...
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Example 8.21: latent class analysis

January 18, 2011 | Nick Horton

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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Example 8.19: Referencing lists of variables

January 3, 2011 | Nick Horton

In section 1.11.4 (p. 50), we discuss referring to lists of variables in a data set. In SAS, this can be done for variable stored in adjacent columns with the "var_x -- var_y" syntax and for variables with sequentially enumerated suffixes with the "va...
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Tools to tidy up R code

December 28, 2010 | Nick Horton

Last week we made an impassioned plea for attention to style in formatting R and SAS code.While it's always better to adopt a consistent style and use it whenever you write code, the reality is that sometimes formatting slips (or you end up repurposing...
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A plea for consistent style!

December 22, 2010 | Nick Horton

As we get close to the end of the year, it's time to look back over the past year and think of resolutions for 2011 and beyond. One that's often on my mind relates to ways to structure my code to make it clearer to others (as well as to myself ...
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