![]() ![]() ![]() I am interested in the school level variation, so perhaps the following model makes more sense? xtmixed studentscore lagstudentscore limitedEng poor `gradeyeardum' schoolyeardum', || schnamyearid : I am not sure if I should estimate both the individual level and school level standard deviations for the variance component. Here's the code I ran: xtmixed studentscore lagstudentscore limitedEng poor `gradeyeardum' schoolyeardum', || schnamyearid : || studentid: I ran the code below but the MLE doesn't seem to converge - I got the "not concave" message for several iterations. ![]() I want to estimate an equivalent model using xtmixed. The coefficients on the school-year dummy variables are the key fixed effects of interest. Where student score is regressed on lag of student score, student's language proficiency and poverty status, and a set of grade-year dummy variables and a set of school-year dummy variables. I ran a model with student effects as a random effect and school effects as fixed effects as follows: xtreg studentscore lagstudentscore limitedEng poor `gradeyeardum' `schoolyeardum', re I am trying to estimate school effects on student scores.
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