efronRSquared: Efron's pseudo r-squared

In rcompanion: Functions to Support Extension Education Program Evaluation

Efron's pseudo r-squared

Description

Produces Efron's pseudo r-squared from certain models, or vectors of residuals, predicted values, and actual values. Alternately produces minimum maximum accuracy, mean absolute percent error, root mean square error, or coefficient of variation.

Usage

efronRSquared(
  model = NULL,
  actual = NULL,
  predicted = NULL,
  residual = NULL,
  statistic = "EfronRSquared",
  plotit = FALSE,
  digits = 3,
  ...
)

Arguments

model	A model of the class lm, glm, nls, betareg, gls, lme, lmerMod, lmerModLmerTest, glmmTMB, rq, loess, gam, negbin, glmRob, rlm, or mblm.
actual	A vector of actual y values
predicted	A vector of predicted values
residual	A vector of residuals
statistic	The statistic to produce. One of "EfronRSquared", "MinMaxAccuracy", "MAE", "MAPE", "MSE", "RMSE", "NRMSE.Mean", "CV".
plotit	If TRUE, produces plots of the predicted values vs. the actual values.
digits	The number of significant digits in the output.
...	Other arguments passed to plot.

Details

Efron's pseudo r-squared is calculated as 1 minus the residual sum of squares divided by the total sum of squares. For linear models (lm model objects), Efron's pseudo r-squared will be equal to r-squared.

This function produces the same statistics as does the accuracy function. While the accuracy function extracts values from a model object, this function allows for the manual entry of residual, predicted, or actual values.

It is recommended that the user consults the accuracy function for further details on these statistics, such as if the reported value is presented as a percentage or fraction.

If modelis not supplied, two of the following need to passed to the function: actual, predicted, residual.

Note that, for some model objects, to extract residuals and predicted values on the original scale, a type="response" option needs to be added to the call, e.g. residuals(model.object, type="response").

Value

A single statistic

Author(s)

Salvatore Mangiafico, [e-mail]

References

https://rcompanion.org/handbook/F_16.html

See Also

accuracy, nagelkerke

Examples

data(BrendonSmall)
BrendonSmall$Calories = as.numeric(BrendonSmall$Calories)
BrendonSmall$Calories2 = BrendonSmall$Calories ^ 2
model.1 = lm(Sodium ~ Calories + Calories2, data = BrendonSmall)

efronRSquared(model.1)

efronRSquared(model.1, statistic="MAPE")

efronRSquared(actual=BrendonSmall$Sodium, residual=model.1$residuals)
efronRSquared(residual=model.1$residuals, predicted=model.1$fitted.values)
efronRSquared(actual=BrendonSmall$Sodium, predicted=model.1$fitted.values)

summary(model.1)$r.squared

rcompanion documentation built on Sept. 17, 2023, 5:07 p.m.