R help - Dec 2017 - package : plm : pgmm question

Dear Sir,



I am using the package pgmm you build in panel regression. However, I found that
when T is 10, N=30, the error would show as following:



system is computationally singular: reciprocal condition number

But the similar code works well on Stata, so I wonder  how I can optimize the
algorithm, for example , the inverse matrix optimization ? And I have checked my
data as well, no multicollinearity problem exists. Another problem is that
although I have some NA in the panel data, the panel dataframe is still
recognized as balanced model. But with plm, the dataframe would be recognized
unbalanced.

Thanks and Best regards,

Ye Dong


	[[alternative HTML version deleted]]

Please talk to the package maintainer whi may not be listen on R-help.

Best,
Uwe Ligges


On 25.12.2017 10:53, Ye Dong wrote:
> Dear Sir,
> 
> 
> 
> I am using the package pgmm you build in panel regression. However, I found
that when T is 10, N=30, the error would show as following:
> 
> 
> 
> system is computationally singular: reciprocal condition number
> 
> But the similar code works well on Stata, so I wonder  how I can optimize
the algorithm, for example , the inverse matrix optimization ? And I have
checked my data as well, no multicollinearity problem exists. Another problem is
that although I have some NA in the panel data, the panel dataframe is still
recognized as balanced model. But with plm, the dataframe would be recognized
unbalanced.
> 
> Thanks and Best regards,
> 
> Ye Dong
> 
> 
> 	[[alternative HTML version deleted]]
> 
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