Dear all,
I am a new user of R, and I would like to use R to estimate dynamaic GMM of
Arellano and Bond (1991).
The package I used is plm and its code pgmm.
However, the regression cannot run and it showed an error message:
Error in solve.default(Reduce(+, A2)) :
system is computationally
Hello,
I uesd Dr. Koenker's code on the following website for quantile regression of
longitudinal data:
http://www.econ.uiuc.edu/~roger/research/panel/rq.fit.panel.R
I can run the code when there are three explanatory variables in X matrix
(ncol(X)=4, because there is a vector 1 at the first
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