This protocol is used to calibrate the eyes for variation due to sampling. All plots are typically null data sets, data that is consistent with a null hypothesis. The protocol is described in Buja, Cook, Hofmann, Lawrence, Lee, Swayne, Wickham (2009) Statistical inference for exploratory data analysis and model diagnostics, Phil. Trans. R. Soc. A, 367, 4361-4383.
rorschach(method, true = NULL, n = 20, p = 0)method for generating null data sets
true data set. If NULL, find_plot_data
will attempt to extract it from the current ggplot2 plot.
total number of samples to generate (including true data)
probability of including true data with null data.