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Monthly Archives: September 2010
Plotting survey responses representing three or more dimensions
Bob Williams recently posted a question to EVALTALK about open source software for plotting survey responses in three dimensions: I’m wondering how to display Likert scale data in three dimensions (ie the Likert scores for each subject on 3 scale … Continue reading
Posted in Praxes
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KFAI rocks
I want to give a shout-out to KFAI, Fresh Air Community Radio. I listen to KFAI just about every day. And every day I am impressed by the station’s diverse programming and skilled volunteer DJs. I urge everyone to tune … Continue reading
Posted in Personal
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Linear mixed-effects regression p-values in R: A likelihood ratio test function
Following Douglas Bates’ advice for those required to produce p-values for fixed-effects terms in a mixed-effects model, I wrote a function to perform a likelihood ratio test for each term in an lmer() object. Bates has championed the notion that … Continue reading
Posted in Praxes
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