Plot the expected value of perfect information (EVPI) from the output of
cea() using ggplot2::ggplot. Intuitively, the EVPI provides an estimate of the
amount that a decision maker would be willing to pay to collect additional data
and completely eliminate uncertainty.
plot_evpi(x, labels = NULL)A cea object produced by cea().
A list of named vectors containing the values and labels of
variables. The elements of each vector are the values of a variable and the
names are the labels. The names of the list are the names of the variables.
See the output returned by get_labels() for an example.
A ggplot object.
See the cea() documentation for an example. If there are multiple subgroups,
then a faceted plot is produced with one plot for each subgroup.