Dear Rob, In SPSS 11.0 it is possible to calculate the estimated power for ANOVAs. I have not tried this for a one-way ANOVA however.
>From the Help guide for "GLM Univariate Options..." "Display...Select Observed power to obtain the power of the test when the alternative hypothesis is set based on the observed value. Select Parameter estimates to produce the parameter estimates, standard errors, t tests, confidence intervals, and the observed power for each test..." My favorite power resource is G*Power. G*Power is an excellent power estimation tool. While there are limitations to the tests it applies to, it does cover ANOVAs. In addition, I recommend G*Power to people BEFORE they start research for getting your needed sample size. It is easy to get your sample size when you enter your desired power and effect size. To get G*Power (free), you go to: http://www.psycho.uni-duesseldorf.de/aap/projects/gpower/index.html How to Use G*Power http://www.psycho.uni-duesseldorf.de/aap/projects/gpower/how_to_use_gpower.html Enjoy Noel Kinder, MA was University of Maryland PhD Student now Child Welfare League of America Research Specialist --- You are currently subscribed to tips as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED]
