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st: Effect size / sample size / power calculation

From   Miranda Kim <[email protected]>
To   [email protected]
Subject   st: Effect size / sample size / power calculation
Date   Wed, 06 Jan 2010 14:27:34 +0000

Could anyone help me with this...
To detect a regression coefficient of 0.41 with standard deviation 0.91 I can compute a sample size (using a 5% level of significance with 90% power) with the following command:
sampsi 0.41 0, p(0.9) sd(0.91) onesam
How could I work out what regression coefficient (effect size) is detectable with a sample size of 150, based on this information?
I need to do this with about 20 regression coefficients.
I am using stata 11.
Many thanks,

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