valmetrics (version 1.0.0)

aic: aic

Description

Calculates the Akaike information criterion (AIC) from observed values, predicted values, the number of observations and the number of model parameters.

Usage

aic(o, p, k)

Arguments

o

A numeric vector. Observed values.

p

A numeric vector. Predicted values.

k

A number. The number of parameters in the model. Note that k includes the intercept, so for example, k is 2 for a linear regression model.

Value

Akaike information criterion (AIC)

Details

Interpretation: smaller is better. Akaike information criterion (AIC) punishes complexity of models; a larger number of parameters (k) means a larger AIC value. As it is sensitive to the number of samples, AIC cannot easily be compared between datasets of different sizes.

References

Piikki K., Wetterlind J., Soderstrom M., Stenberg B. (2021). Perspectives on validation in digital soil mapping of continuous attributes. A review. Soil Use and Management. 10.1111/sum.12694

Examples

# NOT RUN {
obs<-c(1:10)
pred<-c(1, 1 ,3, 2, 4, 5, 6, 8, 7, 10)
aic(o=obs, p=pred, k=2)

# }