samplesize.r determines the sample size, when specified the effect size to be detected, desired statistical power, and significance level.
samplesize.r always specifies two-sided test.
a numeric contains the effect size (product moment correlation) to be detected
a numeric contains the desired statistical power (default 0.80)
a numeric contains the significance level (default 0.05)
Return a numeric containing the appropriate sample size.
Department of Social Psychiatry,
National Institute of Mental Health,
National Center of Neurology and Psychiatry
Cohen J (1988). Statistical power analysis for the behavioral sciences (2nd ed). Hillsdale, NJ: Erlbaum.
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