### Name: getGroupsFormula
### Title: Extract Grouping Formula
### Aliases: getGroupsFormula getGroupsFormula.default getGroupsFormula.gls
###   getGroupsFormula.lmList getGroupsFormula.lme
###   getGroupsFormula.reStruct
### Keywords: models

### ** Examples

getGroupsFormula(y ~ x | g1/g2)



