r2_tjur function

Tjur's R2 - coefficient of determination (D)

This method calculates the Coefficient of Discrimination D

(also known as Tjur's R2; Tjur, 2009 ) for generalized linear (mixed) models for binary outcomes. It is an alternative to other pseudo-R2 values like Nagelkerke's R2 or Cox-Snell R2. The Coefficient of Discrimination D

can be read like any other (pseudo-)R2 value.

r2_tjur(model, ...)

Arguments

• model: Binomial Model.
• ...: Arguments from other functions, usually only used internally.

Returns

A named vector with the R2 value.

Examples

model <- glm(vs ~ wt + mpg, data = mtcars, family = "binomial")
r2_tjur(model)

References

Tjur, T. (2009). Coefficients of determination in logistic regression models - A new proposal: The coefficient of discrimination. The American Statistician, 63(4), 366-372.