Creates a bar chart of categorical variable probabilities with bars
reflecting the probability of category membership for each category of the
observed variable.

```
plot_prob(
x,
variables = NULL,
bars = c("Variable", "group", "class"),
facet = c("group", "class", "Variable"),
bw = FALSE,
...
)
```

## Arguments

- x
An object for which a method exists

- variables
A character vectors with the names of the variables to be
plotted (optional).

- bars
Atomic character, indicating what separate bars represent. One of
`c("Variable", "group", "class")`.

- facet
Atomic character, indicating what separate facets represent. One
of `c("group", "class", "Variable")`.

- bw
Logical. Should the plot be black and white (for print), or color?

- ...
Arguments passed to and from other functions.

## Value

An object of class 'ggplot'.

## Author

Caspar J. van Lissa

## Examples

```
df_plot <- data.frame(Variable = rep(c("u1", "u2"), each = 3),
Category = rep(1:3, 2),
Probability = c(0.3381302605812, 0.148395173612088, 0.513474565806711,
0.472337708760608, 0.118484201496432, 0.40917808974296))
plot_prob(df_plot)
```