[R] package nlme: covariates and self-starting nonlinear regression

[Peter Schlattmann]

Dear all,

I want to include covariates into the self-starting linear regression
functions
SSbiexp and SSfol. Is there a way to do this or do I need to define my
own functions
depending on the covariates?

My second question concerns the function nlme:
Is it possible to use this functions for fixed effects only?



Thanks a lot for your help
Best regards 
Peter

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