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st: mim: xtmixed for unconditional models

From   Nailing Xia <>
Subject   st: mim: xtmixed for unconditional models
Date   Wed, 22 Apr 2009 16:55:06 -0400


I am estimating multilevel models with mulple imputed data (using
-ice-). I have got results from the full model using command - "mim:
xtmixed dvar var1 var2 var3 if [wgt] || schid: || childid:". However,
I have problems getting results when estimating the unconditional
model (i.e., no independent variables, only intercept). I have tried
two commands - "mim: dvar if [wgt] || schid: || childid:"  and "mim:
dvar one if [wgt] || schid: || childid:" (the variable one equals to 1
for all observations). Stata has run for days without giving any
estimates (whereas it took 7 hours for Stata to estimate the full
model) - it seems to be stuck at estimaing for m=3. I have tried both
commands without using -mim-, and both worked fine and gave the same
results. Does anyone know why the unconditional model take so long
when using -mim-? Is there a faster way to do it?

Thank you.

Nailing Xia
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