Careless comparison bites back (again)

August 6, 2012 | 0 Comments

When running stats labs I like to allocate a slightly different subset of data to each student, which acts as an incentive for people to do their own work (rather than copying the same results from a fellow student). We … Continue reading → [Read more...]

R pitfall #3: friggin’ factors

December 15, 2011 | 0 Comments

I received an email from one of my students expressing deep frustation with a seemingly simple problem. He had a factor containing names of potato lines and wanted to set some levels to NA. Using simple letters as example names … Continue reading → [Read more...]

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