st: "xtmixed" and bootstrapping standard errors of a ratio

[lena Lindahl <lena.Lindahl@sofi.su.se>]

Hello!
I want to estimate the correlation in income among pupils who went in 
the same school. In order to achieve the variance components needed to 
calculate the correlation I have used xtmixed in the following way:

xtmixed income || school:, cov(unstructured) variance

Then I get estimates of within and between school variance and their 
standard errors. The correlation is calculated as the proportion of the 
total variance that occurs between schools: ((between 
variance/(between+within variance)). How do I bootstrap standard errors 
of the correlation?

Best wishes
Lena Lindahl

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