Sample size estimation in the analysis of variance

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Description

samplesize.etasq determines the sample size, when specified the number of group, effect size to be detected, desired statistical power, and significance level.

Usage

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samplesize.etasq(k, delta, power=.80, sig.level=.05)

Arguments

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)

Value

Return a numeric containing the appropriate sample size in each group.

Author(s)

Yasuyuki Okumura
Department of Social Psychiatry,
National Institute of Mental Health,
National Center of Neurology and Psychiatry
yokumura@blue.zero.jp

References

Cohen J (1988). Statistical power analysis for the behavioral sciences (2nd ed). Hillsdale, NJ: Erlbaum.

See Also

ind.oneway, ind.oneway.second

Examples

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##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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