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A short tutorial of GPower

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Doi: 10.20982/tqmp.03.2.p051

Mayr, Susanne , Erdfelder, Edgar , Buchner, Axel , Faul, Franz
Keywords: Statistics , statistical power
Tools: G-Power
(no sample data)   (no appendix)

The purpose of this paper is to promote statistical power analysis in the behavioral sciences by introducing the easy to use GPower software. GPower is a free general power analysis program available in two essentially equivalent versions, one designed for Macintosh OS/OS X and the other for MS-DOS/Windows platforms. Psychological research examples are presented to illustrate the various features of the GPower software. In particular, a priori, post-hoc, and compromise power analyses for t-tests, F-tests, and chi-2-tests will be demonstrated. For all examples, the underlying statistical concepts as well as the implementation in GPower will be described.

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