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Re: st: interaction terms with regress (and logit...)


From   "Lawrence Hanser" <lhanser@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: interaction terms with regress (and logit...)
Date   Fri, 7 Apr 2006 12:58:48 -0700

Thanks.  Hwever, isn't xi about categorical variables?  I have two
continuous variables to interact.  I know that I can create a new
variable (gen x1x2=x1*x2)...  What is curious is that if I say

anova y x1 x2 x1*x2

it works.

Larry

On 4/7/06, Nick Winter <nw53@cornell.edu> wrote:
> Because x1*x2 is not a variable in your dataset (and is not even a valid
> name for a variable).
>
> You can either create a new variable that is the product of x1 and x2:
>
>    generate x1Xx2 = x1*x2
>
> and use that in your model, or learn about the -xi- command, which does
> this sort of thing on the fly.
>
> --Nick Winter
>
>
>
> At 03:32 PM 4/7/2006, you wrote:
> >Dear COlleagues:
> >
> >How come
> >
> >logit y x1 x2 x1*x2
> >
> >gives an error "variable x1*x2 not found?"
> >
> >Thanks,
> >
> >Larry
> >
> >*
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>
> --------------------------------------------------------
> Nicholas Winter                           607.255.8819 t
> Assistant Professor                       607.255.4530 f
> Department of Government              nw53@cornell.edu e
> 308 White Hall            falcon.arts.cornell.edu/nw53 w
> Cornell University
> Ithaca, NY 14853-4601
>
>
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*
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