This unit shows how to compute Kappa.
This unit discusses why small samples are often unable to represent populations, especially populations that are heterogeneous.
This unit describes the random number generator program provided free on this website. This program can generate random numbers for several purposes, including sampling participants for a study and assigning those participants to groups.
This unit includes instructions on how to achieve random and stratified random samples, complete with exercises to practice these skills.
This unit includes instructions on how to used random and matched random assignment of subjects to groups, complete with exercises to practice these skills.