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mod0
2005 Nov 07
1
repeated values, nlme, correlation structures
...r a given age group in each nestbox. The aim is
to get an acceptable growth curve (weight against age).
As far as repeated values cannot be handled with standard coStruct
classes of nlme, I have done a first fit with nlme using the mean of
each group. Comparing several models, the best fit is:
modm0c<-nlme(pds~Asym/(1+exp((xmid-age)/scal)),
fixed=list(Asym~1,xmid~1,scal~1),
random=Asym+xmid~1|nichoir,data=croispulm,
start=list(fixed=c(10,5,2.2)),
method="ML",
corr=corCAR1()
)
with pds = weight, age = mean age of each age group, nichoir = nestbox
(a factor...