Message-ID: <1303162279022-3458786.post@n4.nabble.com>
Date: 2011-04-18T21:31:19Z
From: Schatzi
Subject: Power Analysis
I am trying to do a power analysis to get the number of replicas per
treatment.
If I try to get the power it works just fine:
setn=c(2,3)
sdx=c(1.19,4.35)
power.t.test(n = setn, delta = 13.5, sd = sdx, sig.level = 0.05,power =
NULL)
If I go the other way to obtain the "n" I have problems.
sdx=c(1.19,4.35)
pow=c(.8,.8)
power.t.test(n = NULL, delta = 13.5, sd = sdx, sig.level = 0.05, power =
0.8)
Is there any way to do this? Thank you.
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