Graph p-value functions

[mbcann01]

Create functions for graphing p-value functions as described in Modern Epidemiology.

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[mbcann01]

As opposed to a stand-alone pipeable function, consider making a function that acts as an add-on to ggplot2. Perhaps something like stat_p_value_function.

[mbcann01]

Look at episheet from Rothman, and this package: https://github.com/epijim/episheet.
Adapt those p-value function calculations to work in a dplyr pipeline.
Blog about it when done.