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rmsharp (7) [Avatar] Offline
I am guessing that an R option was set to round the output of the pwr function on page 251.

I get the following using 12.13.1 on Mac OS 10.7.1

Note n is not rounded to the whole number 34.

> pwr.t.test(n = , d = 0.8, sig.level = 0.05, power = 0.9, alternative = "two.sided"smilie

Two-sample t test power calculation

n = 33.82554
d = 0.8
sig.level = 0.05
power = 0.9
alternative = two.sided

NOTE: n is number in *each* group

Message was edited by: Mark Sharp