compCurves: Compare regression curves in a pairwise fashion

In statforbiology: Tools for Data Analyses in Biology

Compare regression curves in a pairwise fashion

Description

For regression models containing grouping factors and fitted with the 'drm' function in the 'drc' package, this function compares the different curves for each factor level in a pairwise fashion, according to a series of F tests for the extra-sum-of-squares. Works only with 'drc' objects

Usage

compCurves(
  obj,
  adjusted = c("none", "holm", "hochberg", "hommel", "bonferroni", "BH", "BY", "fdr")
)

Arguments

obj	a drc object
adjusted	a character string, for selecting the method of multiplicity correction. Must be one of: c("none", "holm", "hochberg", "hommel", "bonferroni", "BH", "BY", "fdr")

Value

returns a list with two slots: (i) Pairs: the list of peirwise comparisons, with F values and P-values; (ii) Letters: letter display for the different curves

Author(s)

Andrea Onofri

Examples

metamitron <- getAgroData("metamitron")
head(metamitron)
tail(metamitron)

mod1 <- drm(Conc ~ Time, fct = DRC.expoDecay(),
               curveid = Herbicide,
               data = metamitron)
summary(mod1)
compCurves(mod1, adjusted = "bonferroni")

statforbiology documentation built on Oct. 30, 2024, 9:13 a.m.