calculateFTVA {MIAmaxent}

Calculates variable contributions (FTVA)

Description

Calculates the Fraction of Total Variation Accounted for (Halvorsen et al. 2015), for the selected model or a chosen model from the results of selectEV.

Usage

calculateFTVA(selectedEV, formula = NULL)

Arguments

selectedEV

The list returned by selectEV.

formula

If null, FTVA is calculated for the selected model in selectedEV. Otherwise, a model formula (in the form ~ x + ...) specifying a model in the trail of forward selection (selectEV$selection) for which to calculate FTVA. Response variable is irrelevant.

References

Halvorsen, R., Mazzoni, S., Bryn, A., & Bakkestuen, V. (2015). Opportunities for improved distribution modelling practice via a strict maximum likelihood interpretation of MaxEnt. Ecography, 38(2), 172-183.

Examples

## Not run: 
# From vignette:
calculateFTVA(grasslandEVselect, formula("~ prbygall + geoberg + lcucor1 +
tertpi09 + geolmja1"))

## End(Not run)