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2004 Jul 18
2
bootstrap and nls
Hi, I am trying to bootstrap the difference between each parameters among two non linear regression (distributed loss model) as following: # data.frame > Raies[1:10,] Tps SolA Solb 1 0 32.97 35.92 2 0 32.01 31.35 3 1 21.73 22.03 4 1 23.73 18.53 5 2 19.68 18.28 6 2 18.56 16.79 7 3 18.79 15.61 8 3 17.60 13.43 9 4 14.83 12.76 10 4 17.33 14.91 etc... # non linear model (work well) RaiesLossA.nls<-nls(SolA~a/(1+b*Tps)^c,start=c(a=32,b=0.5,c=0.6))...
2004 Mar 12
0
Basic questions on nls and bootstrap
...C0*exp(-k*Tpst) with Ct the concentration of pollutant at time t, C0 is the initial concentration (i.e. t=0), Tps is the time in days. The table containing data is called «tabMika» Here, you can find my R program: > tabMika<-read.delim("RMika.txt") > tabMika Tps SolA Solb 1 0 32.97 35.92 2 0 32.01 31.35 3 1 21.73 22.03 4 1 23.73 18.53 5 2 19.68 18.28 6 2 18.56 16.79 # and continue like that until 29 days. > library(nls) > attach(tabMika) > Expon<-function(Tps,parm){ + C0<-parm[1] + k<-parm[2] + } > DegSA.nls<-nls(SolA...