Displaying 1 result from an estimated 1 matches for "testnlslist2".
2007 Jun 14
0
nlsList problems: control option does not effect output and strange environment search
...(1+x[3]*exp(-1*x[4]*(1:240-x[5])))^(1/x[3]))+rnorm(240,0,s
derror)
return(Y)}))
params contains different parameters for 200 persons in 4 groups. Next I
sample for each person five observations one at the start, one at the
end and three randomly in between. Now I get the following error
messages:
testnlslist2<-nlsList(SSfpl,groupedData(Y~Time|group, datset))
Error in nls(y ~ cbind(1, 1/(1 + exp((xmid - x)/exp(lscal)))), data =
xy, :
step factor 0.000488281 reduced below 'minFactor' of 0.000976562
Error in nls(formula = formula, data = data, control = control) :
singular gra...