in this example what is the variable represting the treatment groups: The data file for this assignment is the Video-Game Trial SPSS file that was used in HW1. There you looked at a pre-measure of depression called the QIDs. Now we are looking at the outcome measure PHQ which was measured at four times PH1, PHQ2, PHQ3 and PHQ). It contains some background information on participants and the outcome of a non-randomized trial (aka Quasi-Experiment) where subjects with depression were asked if they would like to either be prescribed a second medication for Depression(control), or enroll in the use of video games (Experimental Group) for symptom relief. The outcome measure was the PHQ-9 questionnaire assessed at 4 different times: prior to the intervention and then 3 other times post interventioin. They are at equal intervals of time. Those outcome variables in the file are listed as PHQ1-PHQ4. Below is a link for this questionnaire if you are interested. http://patient.info/doctor/patient-health-questionnaire-phq-9 Your assignment is to use a repeated measures ANOVA to assess the repeated measures PHQ1- PHQ4 values over time. There is a within subjects' factor (the four measures or time), and between subjects factor, comprised of two treatment groups