PlantGrowth {datasets} | R Documentation |
Results from an experiment to compare yields (as measured by dried weight of plants) obtained under a control and two different treatment conditions.
PlantGrowth
A data frame of 30 cases on 2 variables.
[, 1] | weight | numeric |
[, 2] | group | factor |
The levels of group
are ‘ctrl’, ‘trt1’, and ‘trt2’.
Dobson, A. J. (1983) An Introduction to Statistical Modelling. London: Chapman and Hall.
## One factor ANOVA example from Dobson's book, cf. Table 7.4: require(stats) boxplot(weight ~ group, data = PlantGrowth, main = "PlantGrowth data", ylab = "Dried weight of plants", col = "lightgray", notch = TRUE, varwidth = TRUE) anova(lm(weight ~ group, data = PlantGrowth))