n.indep.t.test.eq {samplesize}R Documentation

Sample size for independent Student's t-test with equal group size

Description

Function computes sample size for Student's independent t-test with equal group size

Usage

n.indep.t.test.eq(power = 0.8, alpha = 0.95, mean.diff = 0.8, sd.est = 0.83)

Arguments

power required power 1-beta
alpha required Level I-error 1-alpha
mean.diff required minimum difference between group means
sd.est standard deviation in groups

Value

sample size sample size in each group

Author(s)

Ralph Scherer

References

Bock J., Bestimmung des Stichprobenumfangs fuer biologische Experimente und kontrollierte klinische Studien. Oldenbourg 1998

See Also

n.indep.t.test.neq(), n.paired.t.test(), n.welch.test()

Examples

 n.indep.t.test.eq(power = 0.8, alpha = 0.95, mean.diff = 0.8, sd.est = 0.83)

[Package samplesize version 0.1-6 Index]