[R] power.t.test

[Hank Stevens]

power.t.test() requires a standard deviation as input, but for a two sample 
test, I do not understand what is required. Is it the standard deviation of 
the means (standard error), or of the combined sample?

thanks,
Hank Stevens


Martin Henry H. Stevens, Assistant Professor
338 Pearson Hall
Botany Department
Miami University
Oxford, OH 45056

Office: (513) 529-4206
Lab: (513) 529-4262
FAX: (513) 529-4243
http://www.cas.muohio.edu/botany/bot/henry.html
http://www.muohio.edu/ecology