samplesize (version 0.1-5)

n.indep.t.test.neq: Sample size for independent Student's t-test with unequal group size

Description

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

Usage

n.indep.t.test.neq(power = 0.8, alpha = 0.95, mean.diff = 0.8, sd.est = 0.83, k = 0.5)

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

k

n_2=n_1*k

Value

• N
  total sample size
• n.1
  sample size group 1
• n.2
  sample size group 2

Details

n_1= size group 1, n_2= size group 2, N=n_1+n_2

References

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

See Also

n.inep.t.test.eq(), n.paired.t.test(), n.welch.test()

Examples

n.indep.t.test.neq(power = 0.8, alpha = 0.95, mean.diff = 0.8, sd.est = 0.83, k = 0.5)