Identifying Records in Data Frame A That Are Not Contained In Data Frame B – A Comparison

October 12, 2011 | songpants

Yesterday I launched my first question at Stackoverflow and apparently did a lot of things wrong as I managed to get my question closed wihtin hours I had collected 9 different solutions to the problem and made the mistake to put it all within the original ... [Read more...]

Summarize Data by Several Variables

May 23, 2011 | Kay Cichini

Here's an example how to conveniently summarize data with the cast function (package reshape). By the way you see how this could be done "in-conveniently" by hand. You also see how a for-loop works and how a matrix is constructed and fill...
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Example 8.18: A Monte Carlo experiment

December 13, 2010 | Ken Kleinman

In recent weeks, we've explored methods to fit logistic regression models when a state of quasi-complete separation exists. We considered Firth's penalized likelihood approach, exact logistic regression, and Bayesian models using Markov chain Monte Ca...
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