confusion.matrix: Create a confusion matrix

In burrm/lolcat: Miscellaneous Useful Functions

Create a confusion matrix

Description

Create a confusion matrix from actual and predicted values. Note that this function follows the convention of placing "Predicted" as the row variable and "Actual/Correct" as the column variable for the returned contingency table. This is unlikely to be a compatible format with other packages that use the reverse convention for predicted/actual.

Usage

confusion.matrix(
  actual,
  predicted,
  actual.positive.fn = function(actual) {
     ifelse(actual == 1, 1, 0)
 },
  predicted.positive.fn = function(predicted) {
     ifelse(predicted == 1, 1, 0)
 }
)

Arguments

actual	A vector of values identifying the actual value (default 0,1 or use actual.positive.fn to convert)
predicted	A vector of values identifying the predicted value (default 0,1 or use predicted.positive.fn to convert)
actual.positive.fn	A function that takes values present in actual and converts them to 0,1
predicted.positive.fn	A function that takes values in predicted and converts them to 0,1

Value

A 2x2 matrix showing agreement between actual and predicted.

burrm/lolcat documentation built on Aug. 15, 2024, 6:16 p.m.