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Re: st: interaction terms with regress (and logit...)
Indeed, -xi- doesn't do continuous interactions (odd, in my view, but I
don't use it so haven't noticed or thought about it.
I believe the help for -anova- makes clear that it accepts that syntax --
one more way the world of ANOVA talks and thinks differently, while doing
the same thing as those of us in the world of regression, I suppose.
--NW
At 03:58 PM 4/7/2006, you wrote:
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 <[email protected]> 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
> >
> >*
> >* For searches and help try:
> >* http://www.stata.com/support/faqs/res/findit.html
> >* http://www.stata.com/support/statalist/faq
> >* http://www.ats.ucla.edu/stat/stata/
>
> --------------------------------------------------------
> Nicholas Winter 607.255.8819 t
> Assistant Professor 607.255.4530 f
> Department of Government [email protected] e
> 308 White Hall falcon.arts.cornell.edu/nw53 w
> Cornell University
> Ithaca, NY 14853-4601
>
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
--------------------------------------------------------
Nicholas Winter 607.255.8819 t
Assistant Professor 607.255.4530 f
Department of Government [email protected] e
308 White Hall falcon.arts.cornell.edu/nw53 w
Cornell University
Ithaca, NY 14853-4601
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
