I indicated in an item in the previous issue of this journal that I would be publishing more installments of a series of slide shows representing talks I have given on various aspects of research. See below for a link to the latest in the series, an overview of quantitative data analysis. The slide show is effectively a selective summary of the following topics from my statistics website: summarizing data (variables; simple statistics; effect statistics and statistical models; complex models), and generalizing from sample to population (precision of estimate, confidence limits, statistical significance, p value, errors).