lahraf 发表于 2013-6-15 20:25 
Hello dear member,
Perhaps you have a problem with the number of units at the level 2 regression, b ...
你好,请问你对HLM中的There are no degrees of freedom to estimate sigma_squared. Set σ2
to a constant, or delete one or more of the random effects from the model.这个问题了解吗,能给我解决一下吗