Plot the expected value of perfect information (EVPI) from the output of cea() using ggplot2. 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)

## Arguments

x 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.

## Value

A ggplot object.

## Details

See the cea() documentation for an example. If there are multiple subgroups, then a faceted plot is produced with one plot for each subgroup.