Re: Mixed Model Repeated Measures

Posted by mdaugher on May 14, 2014; 7:49pm
URL: http://spssx-discussion.165.s1.nabble.com/Mixed-Model-Repeated-Measures-tp5726021p5726040.html

Gene,

I am using the techniques discussed in Singer and Willet, Applied Longitudinal Data Analysis.  I'm using a mixed model-linear analysis.  I just don't know how best to enter # of home visits and program duration (# of months in the program) to see if they relate to the dependent variable of nurturing quality.  Since both are continuous variables, do I code them and put them in as a fixed effect or should they be random effects or covariance effects?  When I run the analysis using just time (1st assessment, 2nd assessment, etc), primary language and ethnicity I get significance with one primary language and one ethnicity.  However, when I put in # of home visits and program duration, I get an error message and there is no significance.  Also, it appears that in order to add #of home visits as a random effect, it also has to be entered as a fixed effect.  As I said, I'm new to this type of analysis.