st: decomposition with fixed effects model

[Megan Sheahan <megan.sheahan@gmail.com>]

Hello,

I am interested to know if any Stata or user-written command allows me
to decompose r-squared when using a fixed effects regression model.

Here is the simple model I run: xtreg y x1 x2 x3, fe

I would like to know the contribution of each of the variables -- x1,
x2, and x3 -- in explaining the expected variance of y.

With a standard OLS regression, I've been able to use the use-written
command "rego," which calculates Shapley values.

A simple model like this: reg y x1 x2 x3

Can be decomposed like this: rego y x1 \ x2 \ x3

This command does not seem compatible with fixed effects estimation.
Any suggestions for doing something similar with a fixed effects model
would be most useful.

Many thanks in advance,
Megan
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