Now I think I understand the syntax, and why Ken's command does what it
correctly does. All terms prior to the slash without specified
denominators are tested with the term after the slash. This is a little
cryptic and depends on correctly grouping terms tested with the same
denominator when issuing an ANOVA command. But it makes sense once you
see it. I think the slash is like a shorthand for the lines used to
separate the ANOVA tables
ANOVA y a b c/d tests each of a, b, and c, over d.
ANOVA y a/ b c/d tests a over error, and b and c over d
ANOVA y a/d b/d c/d is disallowed syntax
