Plotting PMCMR Objects
Plots a bar-plot for objects of class "PMCMR".
barPlot(x, alpha = 0.05, ...)
x |
an object of class |
alpha |
the selected alpha-level. Defaults to 0.05. |
... |
further arguments for method |
A barplot where the height of the bars corresponds to the arithmetic mean. The extend of the whiskers are \pm z_{(1-α/2)} \times s_{\mathrm{E},i}, where the latter denotes the standard error of the ith group. Symbolic letters are depicted on top of the bars, whereas different letters indicate significant differences between groups for the selected level of alpha.
The barplot is strictly spoken only valid for normal data, as the depicted significance intervall implies symetry.
## data set chickwts ans <- tukeyTest(weight ~ feed, data = chickwts) barPlot(ans)
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