You will get more power if you keep all the valid data. As Stuart notes, pay close attention to distributional and variance assumptions when sample sizes are greatly different.
Cheers, Karl W. -----Original Message----- From: Stuart McKelvie [mailto:[EMAIL PROTECTED] Sent: Monday, May 15, 2006 5:13 PM To: Teaching in the Psychological Sciences (TIPS) Subject: [tips] RE: stats help Dear Stephen, You can run this with unequal n. Look at variances to see how much they violate the homogeneity assumption. Another idea: Choose a random set of 15 cases from the normal group. Check it their mean matches the mean of the total normals. If so, then run an ANOVA with 11, 15 and 17. Stuart --- To make changes to your subscription go to: http://acsun.frostburg.edu/cgi-bin/lyris.pl?enter=tips&text_mode=0&lang=english
