It's meaningful, but not under the name 'interaction'. The model is the
same as
y ~ x1 + x2 + I(x1*x2)
that is, 'including a product term'. However, needing product terms often
indicates a missed transformation of y (e.g. it might be better to use
log(y)).
On Wed, 28 Nov 2007, Irene Mantzou
Hi all!
this is a rather statistical question:
is it meaningful to consider an interaction effect between 2 continuous
covariates?
for example: lm(y~x1+x2+x1:x2)
Should one of continuous x1, x2 be "transformed" to a categorical variable,
i.e. be classified into groups?
Is it easier to interpre
2 matches
Mail list logo
