I am trying to run a non-linear mixed effect model.  I keep getting the
error of "starting values for the fixed component are not the correct
length"  I tried different sized values for the starting values but keep
getting the same error message.  Any advice would be greatly appreciated.
My code is below.  

 

LVBbis.nlme=nlme(L~LVB(Age,t0,Lmax,K), data=datagr,       

fixed=list(t0~Pop-1,Lmax~Pop-1,K~Pop-1),                         

random=t0+Lmax+K~1,                                  

start=list(fixed=c(-1.54,-1.54,710,700,0.21,0.21)))

 

 

Mike


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