Dear R-project team,
I have a problem with the function varFixed() of the nlme-package.
I used it with the squid-data of Zuur et. al 2009 (chapter 4), to fix
increasing residuals (heterogenetiy) (see graph in the email)
I get the message '
Variance function structure of class varFixed with no parameters, or
uninitialized
Could you help me please?
Kind regards
Franz
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