Hi,
I'm trying to fit nonlinear mixed effects model using nlme function but getting
an error message. Here is what I have:
fitted_model = nlme(scores~spline(b1,b2,b3,kt,time),
fixed = list(b1~1, b2~1, b3~1, kt~1),
random = b1+b2+b3~1,
groups= ~id,
data = sdat,
start = c(b1=3.5,b2=2,b3=.60,kt=3.5),verbose=T)
Error:
Error in spline(b1, b2, b3, kt, time) : invalid interpolation method
In addition: Warning message:
In if (is.na(method)) stop("invalid interpolation method") :
the condition has length > 1 and only the first element will be used
Any help will be highly appreciated
Victor
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