Power analysis for intensive longitudinal studies.

摘要: Intensive longitudinal studies are not for the faint of heart: Each one typically requires a lot of time, effort, and financial resources. Before commencing such a study, therefore, it seems worthwhile to assess its statistical power: Namely, given the proposed design and sample size, what is the probability of detecting a hypothesized effect if one actually exists? If that probability is, for example, 0.5, then it may not make sense to proceed. Why embark on an arduous project if it has only a 50: 50 chance of success? Until recently, however …