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Peer reviewedBonett, Douglas G. – Educational and Psychological Measurement, 1982
Post-hoc blocking and analysis of covariance (ANCOVA) both employ a concomitant variable to increase statistical power relative to the completely randomized design. It is argued that the advantages attributed to the block design are not always valid and that there are circumstances when the ANCOVA would be preferred to post-hoc blocking.…
Descriptors: Analysis of Covariance, Comparative Analysis, Hypothesis Testing, Power (Statistics)
Peer reviewedHopkins, Kenneth D.; Chappell, David – Educational and Psychological Measurement, 1994
Quick power estimates for detecting a difference in two population proportions are expedient during early stages of research planning. Such estimates are tabled and graphed in this article. They are shown to be conservative but accurate for most research situations when proportions fall in the range of 0.25 to 0.75. (SLD)
Descriptors: Comparative Analysis, Data Collection, Estimation (Mathematics), Graphs
