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Some thoughful comments/corrections on our discssion of power for detecting a QYL are offered in the following pdf file from Peter Visscher, Ian White and Andrew Carothers (Edinburgh), Feb 2003.
For calculation of central and noncentral F and chi^2 values (as well as many other distributions), I really like the (FREE!) R Statistical Programming Language. Details:
The R Project for statistical Computing website
US Mirror site for downloading R. Current versions for
An Introduction of R (Walsh notes)
Home Pages: [ Volume One ] - [ Volume Two ] - [ What's new ] - [ Book]
Bruce Walsh. jbwalsh@u.arizona.edu . Comments welcome.