[R-sig-ME] lme with cyclic cubic regression splines
g.czanner at googlemail.com
Thu May 12 11:29:25 CEST 2016
I am trying to fit linear mixed model with fixed effect being cyclic cubic
regression splines, because my data are defined on a circle, while circle
is divided into 24 directions. I defined a variable Direction which is
numeric and has values 1,2,... 24. I receive this error message:
> out.lme.8=lme(Y~ s(Direction,bs="cc",k=8),
Error in model.frame.default(fixed, dataMix) :
invalid type (list) for variable 's(Direction, bs = "cc", k = 8)'
I wonder if anyone has any suggestion, please?
Dr Gabriela Czanner
Lecturer in Ophthalmic Statistics
University of Liverpool
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