Updated Notes

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.

Programs

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

• Alpha Unix (OSF/Tru64)
• Linux
• MacOS (System 8.6 to 9.1 and MacOS X)
• MacOS X (Darwin/X11)
• Windows (95 and later) Alpha Unix (OSF/Tru64)

An Introduction of R (Walsh notes)

1. R as a basic statistical calculator for obtaining p values and plotting probability distributions (6 page pdf file). [ posted 28 Dec. 2001 ]
2. Power Calculations in R (4 page pdf file). [ posted 18 Jan 2002 ]

Home Pages: [ Volume One ] - [ Volume Two ] - [ What's new ] - [ Book]

Bruce Walsh. jbwalsh@u.arizona.edu . Comments welcome.