Dear colleagues!
Is it possible to make predictions in R?
there is an exponential relationship detween y and x
x<-c(0.001,0.003,0.01,0.16,0.3,0.7,0.9)
y<-c(38.8,41.5,44.2,27,26.9,6.9,3)
f<-function(x,a,b){a*exp(b*x)}
fm<-nls(y~f(x,a,b), start=c(a=1,b=1))How one can predict x when y=10 and is it possible to calculate standard error of x? The task is equal to function ED in drc package, but it use logistic regression only.
Best regards, Elena. -- da...@rambler.ru. ______________________________________________ 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.
