Repeated Measures Question: It is difficult to pinpoint your problem by the information you provided in your post but I will try to give you a starting point. The first thing you should specify in a repeated measures ANOVA is the number of groups you have? This is your between-subjects variable. The second thing you need to specify is the amount of timepoints you have. These will serve as your within-subject factors.
A "mixed model" could refer to models with both fixed and random effects but can also refer to models with within and between subjects factors. I assume you mean the latter. Look at between subjects effect to examine the impact of group and within-subjects effect to examine the impact of time. Remember to pay particular attention to the interaction because you may have one or several groups which exhibit a different trend across time. Jeff --------------------------------------------------------------- Jeff Dang, MPH Statistician UCLA Cousins Center for Psychoneuroimmunology (Affiliated with the Neuropsychiatric Institute and Department of Psychiatry and Biobehavioral Sciences) 300 UCLA Medical Plaza, Room 3148 Los Angeles, CA 90095-7057 Tel: 310-267-4389 Fax: 310-794-9247 E-mail: [EMAIL PROTECTED] Web: http://www.cousinspni.org/ ATTENTION The information contained in this message may be legally privileged and confidential. It is intended to be read only by the individual or entity to whom it is addressed or by their designee. If the reader of this message is not the intended recipient, you are on notice that any distribution of this message, in any form, is strictly prohibited. If you have received this message in error, please immediately notify the sender and delete or destroy any copy of this message. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Tuesday, January 27, 2004 6:08 AM To: [EMAIL PROTECTED] Subject: [edstat] repeated measures I'm fitting a repeated measures mixed model, so the explanatory variables are the same for each variate. The subjects can be categorized into group A, B, C etc. Each group has a number of fixed effects parameters. I'm testing whether the mean values of the estimated parameters in each group are different over all responses, but i don't know the best way to describe the test. For instance, am i testing whether the within subject and within group estimated mean values are significantly different. Can someone help? Thanks in advance. . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . ================================================================= . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
