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queden
2002 Mar 01
3
Power of t-test in R vs. S-PLUS
...n values of sample number (5 each), sd (0.2) , significance level
(0.01), and a desired power (80%) I looked for the difference in means.
These values differ: 0.5488882 in R and 0.4322771 in S-PLUS (see dump
below).
Did I overlook any detail or confuse some parameters?
Thanks for your help,
Joern Quedenau
Here are the commands & outputs from both tools:
R 1.4.0
> power.t.test(n=5, sd=0.2, sig.level=0.01, power=0.8, type="two.sample",
alternative="two.sided")
Two-sample t test power calculation
n = 5
delta = 0.5488882
sd = 0.2...