tidy.confusionMatrix: Tidy a(n) confusionMatrix object

In tidyverse/broom: Convert Statistical Objects into Tidy Tibbles

Tidy a(n) confusionMatrix object

Description

Tidy summarizes information about the components of a model. A model component might be a single term in a regression, a single hypothesis, a cluster, or a class. Exactly what tidy considers to be a model component varies across models but is usually self-evident. If a model has several distinct types of components, you will need to specify which components to return.

Usage

## S3 method for class 'confusionMatrix'
tidy(x, by_class = TRUE, ...)

Arguments

x	An object of class confusionMatrix created by a call to caret::confusionMatrix().
by_class	Logical indicating whether or not to show performance measures broken down by class. Defaults to TRUE. When by_class = FALSE only returns a tibble with accuracy, kappa, and McNemar statistics.
...	Additional arguments. Not used. Needed to match generic signature only. Cautionary note: Misspelled arguments will be absorbed in ..., where they will be ignored. If the misspelled argument has a default value, the default value will be used. For example, if you pass conf.lvel = 0.9, all computation will proceed using conf.level = 0.95. Two exceptions here are: tidy() methods will warn when supplied an exponentiate argument if it will be ignored. augment() methods will warn when supplied a newdata argument if it will be ignored.

Value

A tibble::tibble() with columns:

class	The class under consideration.
conf.high	Upper bound on the confidence interval for the estimate.
conf.low	Lower bound on the confidence interval for the estimate.
estimate	The estimated value of the regression term.
term	The name of the regression term.
p.value	P-value for accuracy and kappa statistics.

See Also

tidy(), caret::confusionMatrix()

Examples

# load libraries for models and data
library(caret)

set.seed(27)

# generate data
two_class_sample1 <- as.factor(sample(letters[1:2], 100, TRUE))
two_class_sample2 <- as.factor(sample(letters[1:2], 100, TRUE))

two_class_cm <- confusionMatrix(
  two_class_sample1,
  two_class_sample2
)

# summarize model fit with tidiers
tidy(two_class_cm)
tidy(two_class_cm, by_class = FALSE)

# multiclass example
six_class_sample1 <- as.factor(sample(letters[1:6], 100, TRUE))
six_class_sample2 <- as.factor(sample(letters[1:6], 100, TRUE))

six_class_cm <- confusionMatrix(
  six_class_sample1,
  six_class_sample2
)

# summarize model fit with tidiers
tidy(six_class_cm)
tidy(six_class_cm, by_class = FALSE)

tidyverse/broom documentation built on Nov. 9, 2024, 4:24 a.m.