Hello. This is a follow-up to a question I posted last week. With some previous suggestions from the R-help community, I have been able to plot survival (, hazard, and density) curves using published data for Siler hazard parameters from a number of ethnographic populations. Can the function below be modified, perhaps with a "for" statement, so that multiple curves (different line types---one for each population) are plotted on a single graph for comparison? Thanks so much.
--Trey The function and calls below use the data in this Excel file (feel free to access): https://docs.google.com/leaf?id=0B5zZGW2utJN0ZDk1NjA0ZjUtMWU0ZS00ZGQ3LWIxZTUtOWE0NGVmYWMxODJl&hl=en_US ## - plot Siler survival curve ############################## silsurv<-function(a1,b1,a2,a3,b3) { sil=function(t) { h.t<-a1*exp(-b1*t)+a2+a3*exp(b3*t) S.t<-exp(-a1/b1*(1-exp(-b1*t))-a2*t+a3/b3*(1-exp(b3*t))) d.t<-S.t*h.t #return(d.t) return(S.t) #return(h.t) } t<-seq(0,90,1) plot(t,sil(t),ylim=c(0,1),type='l',cex.lab=0.8,cex.axis=0.75,ylab='S(t)',xlab='Age (years)') } with(hazanth[1,3:7],silsurv(a1=a1,b1=b1,a2=a2,a3=a3,b3=b3));title(main=hazanth[1,1],cex.main=0.9) # plot for Hadza with(hazanth[2,3:7],silsurv(a1=a1,b1=b1,a2=a2,a3=a3,b3=b3));title(main=hazanth[2,1],cex.main=0.9) # plot for Ache with(hazanth[3,3:7],silsurv(a1=a1,b1=b1,a2=a2,a3=a3,b3=b3));title(main=hazanth[3,1],cex.main=0.9) # plot for Hiwi with(hazanth[4,3:7],silsurv(a1=a1,b1=b1,a2=a2,a3=a3,b3=b3));title(main=hazanth[4,1],cex.main=0.9) # plot for !Kung with(hazanth[5,3:7],silsurv(a1=a1,b1=b1,a2=a2,a3=a3,b3=b3));title(main=hazanth[5,1],cex.main=0.9) # plot for Yanomamo with(hazanth[6,3:7],silsurv(a1=a1,b1=b1,a2=a2,a3=a3,b3=b3));title(main=hazanth[6,1],cex.main=0.9) # plot for Tsimane ############################### ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
