During the past decades, count-data models (in particular, Poisson and negative-binomial-based regression models) have gained relevance in empirical social research. While identifying and interpreting main effects is relatively straightforward for this class of models, the integration of...

We have written two Stata programs (do-files) dealing with spell data. The first program, splitspells, splits spell data in such a way that every split spell within the same case is either parallel or unique (in respect to the time period covered by the spells). This could be done by splitting...

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