Is is checked whether 'term2' is different from 'term1' in adding information to the model. If both are main factors, i.e. no interactions terms, it is checked whether levels of 'term2' differ from those of 'term1'. Otherwise, 'term2' is an interaction with a part being different from 'term1'.
checkVars(Data, term1, term2)(list) with components \"Diff\"=part of 'term2' distinguishing it from 'term1', \"AddInfo\"=message informing about potential problems with 'term2'
(data.frame) containing all variables of 'term1' and 'term2'
(character) term of a model formula as returned by 'attr(terms(form), \"term.labels\")')
(character) 2nd term of a model formula as returned by 'attr(terms(form), \"term.labels\")') to check against 'term1'
Andre Schuetzenmeister andre.schuetzenmeister@roche.com