ibMembers of the union are '>IbBetareg, '>IbGlm, '>IbLm, '>IbLmer, '>IbNegbin, '>IbNls, '>IbVglm
Each member of the union has a slot with the initial object
corrected by the ib (see getObject) and a second slot with
extra meta data from ib (see getExtra).
IbBetareg-class: fitted model by betareg from betareg
IbGlm-class: fitted model by glm from stats
IbLm-class: fitted model by lm from stats
IbLmer-class: fitted model by lmer from lme4
IbNegbin-class: fitted model by glm.nb from MASS
IbNls-class: fitted model by nls from stats
IbVglm-class: fitted model by vglm from VGAM
The `Functions` section describes members of the class union.