Description Usage Arguments Value Author(s) References See Also Examples
samplesize.etasq
determines the sample size, when specified the number of group, effect size to be detected, desired statistical power, and significance level.
1 | samplesize.etasq(k, delta, power=.80, sig.level=.05)
|
k |
a numeric contains the number of group |
delta |
a numeric contains the effect size (η^2) to be detected |
power |
a numeric contains the desired statistical power (default 0.80) |
sig.level |
a numeric contains the significance level (default 0.05) |
Return a numeric containing the appropriate sample size in each group.
Yasuyuki Okumura
Department of Social Psychiatry,
National Institute of Mental Health,
National Center of Neurology and Psychiatry
yokumura@blue.zero.jp
Cohen J (1988). Statistical power analysis for the behavioral sciences (2nd ed). Hillsdale, NJ: Erlbaum.
1 2 3 | ##Cohen (1988) ex.8.10
f <- .25
samplesize.etasq(k=4, delta= f^2/(1+f^2), power=.80, sig.level=.05)
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Loading required package: gtools
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