title: The power of analysis: statistical perspectives. Part 2.
abstract: A discussion of the importance of statistical power in research is presented accompanied by nomograms for determining sample size and statistical power for the Student's paired and unpaired t tests with a Type I error of 5%. A brief review of statistical inference is presented. Some findings from Part I are reviewed.
authors.affiliation: Division of Biometry and Applied Sciences, National Institute of Mental Health, Bethesda, MD 20817.
authors.forename: J J
authors.initials: JJ
authors.lastname: Bartko
authors.forename: A E
authors.initials: AE
authors.lastname: Pulver
authors.forename: W T
authors.initials: WT
authors.lastname: Carpenter
mesh_terms: D002986:Clinical Trials as Topic; D006801:Humans; D011336:Probability; D011594:Psychometrics; D011897:Random Allocation; D013223:Statistics as Topic