didacticPlot: didacticPlot
In userfriendlyscience: Quantitative Analysis Made Accessible

Description Usage Arguments Value Examples

didacticPlot is useful for making ggplot2 plots of distributions of t, F, Chi^2, and Pearson r, showing a given value, and shading the arie covering the more extreme values. didacticPlotTheme is the basic theme.

didacticPlot(foundValue, statistic, df1, df2 = NULL,
             granularity = 1000, xLim = NULL, yLab = NULL,
             lineCol = "red", lineSize=1,
             surfaceCol = "red", textMarginFactor = 20,
             sided="two")
didacticPlotTheme(base_size = 14, base_family = "")

`foundValue`	The value to indicate (the 'found' value).
`statistic`	One of "r", "t", "f" or "chisq".
`df1, df2`	The degrees of freedom; only use df1 for the r, t and chi^2 test; for the F-test, use df1 for the degrees of freedom of the denominator and df2 for the degrees of freedom of the numerator.
`granularity`	Steps to use for x-axis.
`xLim`	Vector; minimum and maximum values on x axis.
`yLab`	Label on y axis.
`lineCol`	Colour of density line.
`lineSize`	Size of density line.
`surfaceCol`	Colour of coloured surface area.
`textMarginFactor`	Used to calculate how close to the vertical line text labels should appear.
`sided`	Whether to make a plot for a 2-sided or 1-sided test.
`base_size, base_family`	Passed on to the grey ggplot theme.

didacticPlot returns an object that contains the plot in the $plot element.

didacticPlot(1, statistic='chisq', df1=2);

didacticPlot(1, statistic='t', df1=40);

didacticPlot(2.02, statistic='t', df1=40, textMarginFactor=25);

### Two sample t-test for n1 = n2 = 250, showing
### p-value of 5%
# a<-didacticPlot(1.96, statistic='t', df1=498);