Agree with Greg's point. In fact it does not make logical sense in many cases. Similar to the use of the "statistically unreliable" reliability measure Cronbach's alpha in some non-statistical fields. -- View this message in context: http://r.789695.n4.nabble.com/Power-analysis-tp2524729p2524907.html Sent from the R help mailing list archive at Nabble.com.