Tetra data frame has 9 rows and 2 columns from an experiment
on the pharmacokinetics of tetracycline.
This data frame contains the following columns:
a numeric vector of time since drug administration (hr).
a numeric vector of tetracycline concentrations.
Bates and Watts (1998), Nonlinear Regression Analysis and Its Applications, Wiley (Appendix A1.5).
1 2 3 4 5 6 7 8 9
plot(conc ~ time, data = Tetra, las = 1, xlab = "Time since drug administration (hr)", ylab = "concentration", main = "Tetracycline data with fitted curve") fm1 <- nls(conc ~ SSfol(1.0, time, lKe, lKa, lCl), Tetra) summary(fm1) usr <- par("usr") xx <- seq(usr, usr, len = 101) lines(xx, predict(fm1, list(time = xx)))
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