> attr(terms(~B*A), "term.labels")
[1] "B" "A" "B:A"
> attr(terms(~A/C), "term.labels")
[1] "A" "A:C"
> attr(terms(~B*A/C), "term.labels")
[1] "B" "A" "B:A" "B:A:C"
> attr(terms(~(B*A)/C), "term.labels")
[1] "B" "A" "B:A" "B:A:C"
> attr(terms(~B*(A/C)), "term.labels")
[1] "B" "A" "A:C" "B:A" "B:A:C"
>
The issue is precedence of operations. "*" has higher precedence than "/".
This is exactly the same issue you see in ordinary arithmetic
> 1+2*3
[1] 7
> (1+2)*3
[1] 9
>
Rich
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