Gerrit, thanks for the suggestion.  samplesize::n.ttest does seem to handle 
unequal variances. 

    On Tuesday, December 20, 2016 2:55 AM, Gerrit Eichner 
<gerrit.eich...@math.uni-giessen.de> wrote:
 
 Hello, Mauricio,

maybe pwr.t2n.test() in package pwr or/and n.ttest() in package samplesize do 
what you need/want.

  Hth  --  Gerrit


> On Dec 19, 2016, at 1:47 PM, Mauricio Cornejo via R-help 
> <r-help@r-project.org> wrote:
>
> Is there a function similar to stats::power.t.test that can handle unequal 
> variances from two samples?
> I noticed that stats::t.test has an argument for indicating whether or not to 
> treat the two sample variances as equal.  Wondering why stats::power.t.test 
> doesn’t have that option.
> Thanks, Mauricio
   
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