R help - Apr 2009 - seemingly unrelated regression

Hello,

I am working on the model of seemingly unrelated regression. I came across
with the error message:

Log determinant of residual covariance: NA 
Warning messages:
  NAs generated in: log(x)

I have three linear models which contain 21 explanatory variables and there
are about 300 data points.

Could anyone please give some idea what is wrong with the model?
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livia wrote:
> 
> Hello,
> 
> I am working on the model of seemingly unrelated regression. I came across
> with the error message:
> 
> Log determinant of residual covariance: NA 
> Warning messages:
>   NAs generated in: log(x)
> 
> I have three linear models which contain 21 explanatory variables and
> there are about 300 data points.
> 
> Could anyone please give some idea what is wrong with the model?
> 
We can't possibly help without knowing what functions and packages you are
trying to use
(the results of sessionInfo() would be useful), and most likely we can't
help
without a reproducible example ...

  Ben Bolker

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