DNase {datasets} | R Documentation |
The DNase
data frame has 176 rows and 3 columns of data
obtained during development of an ELISA assay for the recombinant
protein DNase in rat serum.
DNase
This data frame contains the following columns:
10
< ... < 3
indicating the assay run.
Davidian, M. and Giltinan, D. M. (1995) Nonlinear Models for Repeated Measurement Data, Chapman & Hall (section 5.2.4, p. 134)
Pinheiro, J. C. and Bates, D. M. (2000) Mixed-effects Models in S and S-PLUS, Springer.
require(stats) coplot(density ~ conc | Run, data = DNase, show = FALSE, type = "b") coplot(density ~ log(conc) | Run, data = DNase, show = FALSE, type = "b") ## fit a representative run fm1 <- nls(density ~ SSlogis( log(conc), Asym, xmid, scal ), data = DNase, subset = Run == 1) ## compare with a four-parameter logistic fm2 <- nls(density ~ SSfpl( log(conc), A, B, xmid, scal ), data = DNase, subset = Run == 1) summary(fm2) anova(fm1, fm2)