Plot MID Breakdown with ggplot2

For "midbrk" objects, ggmid() visualizes the breakdown of a prediction by component functions.

Usage

# S3 method for class 'midbrk'
ggmid(
  object,
  type = c("waterfall", "barplot", "dotchart"),
  theme = NULL,
  terms = NULL,
  max.nterms = 15L,
  vline = TRUE,
  others = "others",
  pattern = c("%t=%v", "%t:%t"),
  format.args = list(),
  ...
)

# S3 method for class 'midbrk'
autoplot(object, ...)

Arguments

object

a "midbrk" object to be visualized.

type

the plotting style. One of "waterfall", "barplot" or "dotchart".

theme

a character string or object defining the color theme. See color.theme for details.

terms

an optional character vector specifying which terms to display.

max.nterms

the maximum number of terms to display in the plot. Less important terms will be grouped into a "catchall" category.

vline

logical. If TRUE, a vertical line is drawn at the zero or intercept line.

others

a character string for the catchall label.

pattern

a character vector of length one or two specifying the format of the axis labels. The first element is used for main effects (default "%t = %v"), and the second is for interactions (default "%t:%t"). Use "%t" for the term name and "%v" for its value.

format.args

a named list of additional arguments passed to format for formatting the values. Common arguments include digits, nsmall, and big.mark.

...

optional parameters passed on to the main layer.

Value

ggmid.midbrk() returns a "ggplot" object.

Details

This is an S3 method for the ggmid() generic that creates a breakdown plot from a "midbrk" object, visualizing the contribution of each component function to a single prediction.

The type argument controls the visualization style. The default, type = "waterfall", creates a waterfall plot that shows how the prediction is built up from the intercept, with each term's contribution sequentially added or subtracted. The type = "barplot" option creates a standard bar plot where the length of each bar represents the magnitude of the term's contribution. The type = "dotchart" option creates a dot plot showing the contribution of each term as a point connected to a zero baseline.

See also

mid.breakdown, ggmid, plot.midbrk

Examples

data(diamonds, package = "ggplot2")
set.seed(42)
idx <- sample(nrow(diamonds), 1e4)
mid <- interpret(price ~ (carat + cut + color + clarity)^2, diamonds[idx, ])
#> 'model' not passed: response variable in 'data' is used
mbd <- mid.breakdown(mid, diamonds[1L, ])

# Create a waterfall plot
ggmid(mbd, type = "waterfall")


# Create a bar plot with a different theme
ggmid(mbd, type = "barplot", theme = "highlight")


# Create a dot chart
ggmid(mbd, type = "dotchart", size = 3)