Results from an experiment to compare yields (as measured by dried weight of plants) obtained under a control and two different treatment conditions.
A data frame of 30 cases on 2 variables.
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); require(graphics) 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))
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