r2_ferrari function

Ferrari's and Cribari-Neto's R2

Calculates Ferrari's and Cribari-Neto's pseudo R2 (for beta-regression models).

r2_ferrari(model, ...)

## Default S3 method:
r2_ferrari(model, correct_bounds = FALSE, ...)

Arguments

• model: Generalized linear, in particular beta-regression model.
• ...: Currently not used.
• correct_bounds: Logical, whether to correct the bounds of the response variable to avoid 0 and 1. If TRUE, the response variable is normalized and "compressed", i.e. zeros and ones are excluded.

Returns

A list with the pseudo R2 value.

Examples

data("GasolineYield", package = "betareg")
model <- betareg::betareg(yield ~ batch + temp, data = GasolineYield)
r2_ferrari(model)

References

• Ferrari, S., and Cribari-Neto, F. (2004). Beta Regression for Modelling Rates and Proportions. Journal of Applied Statistics, 31(7), 799–815. tools:::Rd_expr_doi("10.1080/0266476042000214501")