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 object of class c("nfnGroupedData", "nfGroupedData",
"groupedData", "data.frame")
containing the following columns:
10
< ... < 3
indicating the assay run.
This dataset was originally part of package nlme
, and that has
methods (including for [
, as.data.frame
, plot
and
print
) for its grouped-data classes.
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); require(graphics) coplot(density ~ conc | Run, data = DNase, show.given = FALSE, type = "b") coplot(density ~ log(conc) | Run, data = DNase, show.given = 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)