search for: thridexplantory

Hey everyone, I know I've come across this somewhere, in either the blue or white books or in one of the help docs but I can't put my hand on it. What's the name of the statistical notation used in R? responseVar ~ anExplantory:anotherExplantory + thridExplantory Is this part of a coherent framework of notation that is as applicable to models which are not generalized linear models as to glms? Are there alternative systems of notation which are equally effective or even more general that any of you could point me towards? I'm working on spatial analy...