1. P

    Sample sizer calculation for intestinal surgery

    Hello there, i'm a clinical researcher currently involved in setting up a study to determine whether a certain profylactic treatment to reduce post-operative complications is effective. However, i keep running into all kinds of different sample size calculations and different effect size...
  2. J

    Determining sample size in a factorial repeated measures ANOVA using GPower

    Hi all Can anybody tell me which F-test option in G power is appropriate to find out the sample size for a 2x2x2 repeated measures ANOVA? The three within subjects factors are A, B & C. I am interested in finding out how many subjects I will require to find a main effect of A...