R function for proportion plots

proportion.plot v 1.2

An R function  that draws proportion plots, showing the respective percentages of the members of two groups across the distribution of a variable. Group proportions are intuitive, more visually readable than density ratios, and more robust to fluctuations in the data. This function can calculate group proportions from the means and SDs of two normal distributions, from the empirical distributions of two groups, or from idealized normal distributions with the same means and SDs as the empirical distributions.