[R] Power calculation

[Chuck Cleland]

On 6/10/2010 8:26 AM, Samuel Okoye wrote:
> Hello,
> 
> Is there any R function which does power calculation for unbalanced groups (n1 neq n2)? Since power.t.test has n
> 
> Number of observations (per group).
> 
> Many thanks,
> Samuel

  See pwr.t2n.test() in the pwr package.

http://finzi.psych.upenn.edu/R/library/pwr/html/pwr.t2n.test.html

  You might have found it by doing the following in R:

RSiteSearch("power analysis", restrict='function')

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Chuck Cleland, Ph.D.
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