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3607
2008 May 04
1
Residual resampling for non linear reg model
...rror in nls(resample.mp ~ cases/(alpha + (beta * cases)), start = init.values, : singular gradientafter R has only produced a few bootstraps.Could anyone suggest where I am going wrong? Would greatly appreciate it!Mary manpower<-read.table("http://www.creem.st-and.ac.uk/len/classes/mt3607/data/manhours_surgical.dat", header=TRUE)#attach dataattach(manpower)B<-999#number of data pointsn<-dim(manpower)[1]#alpha level to use for the confidence limitsalpha<-0.05#matrix that's going to contain the bootstrap coefficientsboot.coef<-matrix(NA, B+1, 2)#fit the initial mo...