class_imbalance: Class Imbalance

In rtemis: Schema-Driven Machine Learning and Visualization

Class Imbalance

Description

Calculate class imbalance as given by:

I = K\cdot\sum_{i=1}^K (n_i/N - 1/K)^2

where K is the number of classes, and n_i is the number of instances of class i

Usage

class_imbalance(x)

Arguments

x	Vector, factor: Outcome.

Value

Numeric.

Author(s)

EDG

Examples

# iris is perfectly balanced
class_imbalance(iris[["Species"]])
# Simulate imbalanced outcome
x <- factor(sample(c("A", "B"), size = 500L, replace = TRUE, prob = c(0.9, 0.1)))
class_imbalance(x)

rtemis documentation built on Oct. 20, 2026, 1:06 a.m.