n.indep.t.test.neq {samplesize} | R Documentation |
Function computes sample size for independent Student's t-test with unequal group size
n.indep.t.test.neq(power = 0.8, alpha = 0.95, mean.diff = 0.8, sd.est = 0.83, k = 0.5)
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 |
n_1= size group 1, n_2= size group 2, N=n_1+n_2
N |
total sample size |
n.1 |
sample size group 1 |
n.2 |
sample size group 2 |
Ralph Scherer
Bock J., Bestimmung des Stichprobenumfangs fuer biologische Experimente und kontrollierte klinische Studien. Oldenbourg 1998
n.indep.t.test.eq(), n.paired.t.test(), n.welch.test()
n.indep.t.test.neq(power = 0.8, alpha = 0.95, mean.diff = 0.8, sd.est = 0.83, k = 0.5)