Specify a spatial explicit offsetSource:
Including offsets is another option to integrate spatial prior information in linear and additive regression models. Offsets shift the intercept of the regression fit by a certain amount. Although only one offset can be added to a regression model, it is possible to combine several spatial-explicit estimates into one offset by calculating the sum of all spatial-explicit layers.
add_offset(x, layer, add = TRUE) # S4 method for BiodiversityDistribution,SpatRaster,logical add_offset(x,layer,add) # S4 method for BiodiversityDistribution,sf,logical add_offset(x,layer,add)
Adds an offset to a
This function allows to set any specific offset to a regression
model. The offset has to be provided as spatial
SpatRaster object. This
function simply adds the layer to a
Note that any transformation of the offset (such as
log) has do be done externally!
If the layer is range and requires additional formatting, consider using the
add_offset_range() which has additional functionalities such
such distance transformations.
Since offsets only make sense for linear regressions (and not for instance regression tree based methods such as engine_bart), they do not work for all engines. Offsets specified for non-supported engines are ignored during the estimation
Merow, C., Allen, J.M., Aiello-Lammens, M., Silander, J.A., 2016. Improving niche and range estimates with Maxent and point process models by integrating spatially explicit information. Glob. Ecol. Biogeogr. 25, 1022–1036. https://doi.org/10.1111/geb.12453