Electronic sources that are also worth a look are
http://www.statsoftinc.com/textbook/stpowan.html
And the manual for GPower, which is free software for sample size
calculation.
http://www.psycho.uni-duesseldorf.de/aap/projects/gpower/
GPower uses effect size notation but has an effect size calculator for those
who think in terms of means and SDs.
Ronan M Conroy ([email protected])
Lecturer in Biostatistics
Royal College of Surgeons
Dublin 2, Ireland
+353 1 402 2431 (fax 2764)
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