grqreg fails after mi estimate

[E. David Aja]

Hello all,

I'm using Stata 12.1 on Windows with the Standardized World Income Inequality Database, which is a panel data set with 100 imputations in each country-year.

mi xtset iso year
mi estimate, post: qreg lgni gini_net
grqreg, cons ci ols olsci reps(50)

Stata completes estimation of the quantile regression, but I receive the following error when I try to plot the coefficients with user-written command grqreg:

data has been altered since qreg was estimated
r(459);

I don't know why this is happening. Any ideas?

Thanks,
David.