Dear all,
I am tring to model heterogeneity in level 1 residual variance (sigma^2).
In my model, I have
DV: mathach
IV: Female
If I use the syntax:
xtmixed mathach female || id:female , cov(unstruct) nocons , ml
It gives me "one sigma^2. However, I want to model the sigma^2 for
male and female, respectively.
Does any expert know the syntax?
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