Great Measurement but Small Sample Size: Case Study of Videotaped Families

New York Times reports on an interesting UCLA study that involved video taping 32 Los Angeles families over the course of a week. The study generated rich data for analysis. It's great to see researchers moving beyond self-report measures towards real-world well-coded behavioural observations. However, great measurement does not overcome issues of a small sample size.

Statistical Power Analysis in G*Power 3

G*Power 3 is an excellent piece of software for performing statistical power analysis. It is particularly useful for applied researchers who need to perform a power analysis as part of their research. The software is free, runs on Windows, and provides a user friendly GUI. G*Power 3 can be downloaded here This post discusses the features of G*Power 3 and provides examples of some of the useful plots that can be generated.