Displaying 1 result from an estimated 1 matches for "croispulm".
2005 Nov 07
1
repeated values, nlme, correlation structures
...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 of 17 levels)
Based on the empirical autocorrelation function of the normalised
residuals drawn from this model one can accept...