[R-sig-ME] Cross-classified multiple membership models
kyler at mail.smu.edu
Thu Jun 3 21:15:16 CEST 2010
Is it possible to perform a cross-classified multiple membership model with lmer? Here's the data scenario. I have mathematics data for 2500 kids across four measurement occasions. At each occasion, they are in a separate teacher's classroom (cross-classified, not truly nested). However, there are times that the kids are taking more than one math course during that semester (multiple membership; for example, in a remedial math course AND in another math course with their cohort). Here's an example:
id time teacher score
1 1 1005 118
1 2 1021 125
1 2 1024 125
1 3 1151 139
1 4 1148 164
See how at time==2, person 1 is in two separate math courses, but receives the same score for both "rows" of data since the administration of the instrument occurred only once at that time point.
When I looked through the archive, I found one reference from Doug a year ago that said that he didn't think this was possible yet. However, I thought that maybe someone worked a solution since then.
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