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 singular: reciprocal condition number =
2.27327e-27."
Could I please ask, how could I deal with this problems, or are there any other
package which can help me estimate dynamic GMM?
Many thanks for help.
--
Hao-pang