# A power primer.

**Patricia Cohen**

CiteWeb id: 19920000001

CiteWeb score: 26758

One possible reason for the continued neglect of statistical power analysis in research in the behavioral sciences is the inaccessibility of or difficulty with the standard material. A convenient, although not comprehensive, presentation of required sample sizes is provided here. Effect-size indexes and conventional values for these are given for operationally defined small, medium, and large effects. The sample sizes necessary for .80 power to detect effects at these levels are tabled for eight standard statistical tests: (a) the difference between independent means, (b) the significance of a product—moment correlation, (c) the difference between independent r s, (d) the sign test, (e) the difference between independent proportions, (f) chi-square tests for goodness of fit and contingency tables, (g) one-way analysis of variance, and (h) the significance of a multiple or multiple partial correlation.

**A power primer.**" is placed in the Top 1000 of the best publications in CiteWeb. Also in the category Mathematics it is included to the Top 100. Additionally, the publicaiton "

**A power primer.**" is placed in the Top 100 among other scientific works published in 1992.

- www.personal.kent.edu/~marmey/quant2spring04/Cohen%20(1992)%20-%20PB.pdf
- www.tqmp.org/Content/vol03-2/p079/p079.pdf
- www.iksweb.org/repository/docs/politicallandscape_ENG_913183.pdf
- www.ncbi.nlm.nih.gov/pubmed/19565683
- pubmed.cn/19565683
- https://www.scienceopen.com/document/vid?id=7f2e086b-e486-423a-be87-2d4b04b6c8a7
- dx.doi.org/10.1037/0033-2909.112.1.155
- doi.apa.org/getdoi.cfm?doi=10.1037/0033-2909.112.1.155

Patricia Cohen,

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