[R] Least Squares Method

[Vana]

Hi everyone,
I am running the 'gls' command (least squares method) for a number of data
out of which many are zeros. I strongly believe that the output is wrong and
I think that this is due to the large number of zero values included in my
dataset.  
I would like to ask if there is a command that would allow me to run the gls
command disregarding all the zero values?  

Thank you in advance...

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