Prof Brian Ripley <[EMAIL PROTECTED]> writes:
> The difference is between testing and crossing. In a / b the levels
> of b are unrelated for different levels of a, whereas in a*b they are the
> same levels.
"...nesting and crossing", of course.
--
O__ Peter Dalgaard Blegd
On Wed, 12 Nov 2003, Landis, R Matthew wrote:
> Dear R-help folks,
>
> Can someone guide me to a source where I can learn more about the / operator
> in model formulae? I found a reference to it in Venables and Ripley's MASS,
> p. 142, where it says, in reference to ANCOVA: "Terms of the form
Dear R-help folks,
Can someone guide me to a source where I can learn more about the / operator
in model formulae? I found a reference to it in Venables and Ripley's MASS,
p. 142, where it says, in reference to ANCOVA: "Terms of the form a/x,
where a is a factor, are best thought of as 'separat
