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Re: st: 'Rolling' Slope Dummy
At 12:32 AM 3/6/2005 +0000, Robert Gaskell wrote:
I'm not quite sure what you are doing - by "intercept" do you mean the
dummy variable for group membership? Or, do you literally mean that you
have specified -noconstant- when running your models? Anyway, whatever you
mean, my guess is you want it (constant and/or dummy variable) in there.
Thanks very much for that - your notes have been extremely helpful and
answered my question fully! However, I have found that when
introducing these 'interaction effects between continuous variables',
if I include the slope term *or* the intercept term the coefficients
are significant, but when including both (as you suggest), the
coefficients are insignificant. Does the intercept term need to be
included where the mid-point of the variable that is being added in is
zero, as in this case?
You might try posting a simple example of the generate and regress commands
that you are using so we can see what is going on (it might be that there
is an error and my directions were not so clear after all!). Or, email to
me separately and I'll take a look.
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
WWW (personal): http://www.nd.edu/~rwilliam
WWW (department): http://www.nd.edu/~soc
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