Hi,
I need to do a power analysis in G*power for my study. My research is part of a larger study for which the data is already collected, so my sample size is predetermined for me. I don't have access to the actual data yet. (note: I will be looking at a patient group and a control group over 3 different time points. The patient group have already completed treatment prior to the first time point and so there is no interventions during the study, it is just observational of each group's self reported symptoms over time). Where do I get the d value from in order to conduct this post hoc power analysis? Also which settings should I be selecting in g*power? Does it depend on which analysis I am going to run? I am thinking a repeated measures ANOVA might be best but also happy for advise on this.
Thanks in advance for any guidance anyone can provide
I need to do a power analysis in G*power for my study. My research is part of a larger study for which the data is already collected, so my sample size is predetermined for me. I don't have access to the actual data yet. (note: I will be looking at a patient group and a control group over 3 different time points. The patient group have already completed treatment prior to the first time point and so there is no interventions during the study, it is just observational of each group's self reported symptoms over time). Where do I get the d value from in order to conduct this post hoc power analysis? Also which settings should I be selecting in g*power? Does it depend on which analysis I am going to run? I am thinking a repeated measures ANOVA might be best but also happy for advise on this.
Thanks in advance for any guidance anyone can provide