Negative Binomial regression and predicted probabilities in SPSS

For my dissertation I have been estimating negative binomial regression models predicting the counts of crimes at small places (i.e. street segments and intersections). When evaluating the fit of poisson regression models and their variants, you typically make a line plot of the observed percent of integer values versus the predicted percent by the models....  Continue reading Negative Binomial regression and predicted probabilities in SPSS

SPSS Statistics and R: An Update

SPSS Statistics was, as far as I know, the first commercial software to deliver an integration with the R statistical language. ¬†It first appeared in SPSS 16, over six years ago at this writing, complementing the Python language integration that first appeared in SPSS 14. ¬†This post reviews the rationale and developments in this feature.  Continue reading SPSS Statistics and R: An Update