Proactive preliminary minimum sample size determination can be useful for the early planning stages of a latent variable modeling study to set a realistic scope, long before the model and population are finalized. This study examined existing methods and proposed a new method for proactive preliminary minimum sample size determination.

In cluster-randomized trials (CRTs) of social work interventions, groups are assigned to treatment conditions. Conducting a power analysis ensures that enough groups are sampled for testing hypotheses. The power analysis method and inputs must be informed by the hypotheses, effects to be tested, and the data analysis plans. The authors present a…

Stepwise methods are frequently employed in educational and psychological research, both to select useful subsets of variables and to evaluate the order of importance of variables. Three problems with stepwise applications are explored in some detail. First, computer packages use incorrect degrees of freedom in their stepwise computations,…