Conventional effects size
Give the conventional effect size (small, medium, large) for the tests available in this package
cohen.ES(test = c("p", "t", "r", "anov", "chisq", "f2"),
size = c("small", "medium", "large"))test |
The statistical test of interest |
size |
The ES : small, medium of large? |
The corresponding effect size
Stephane CHAMPELY
Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). Hillsdale,NJ: Lawrence Erlbaum.
## medium effect size for the correlation test cohen.ES(test="r", size="medium") ## sample size for a medium size effect in the two-sided correlation test ## using the conventional power of 0.80 pwr.r.test(r=cohen.ES(test="r",size="medium")$effect.size, power=0.80, sig.level=0.05, alternative="two.sided")
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