Re: st: how to compare the values of a variable at different observations

[Richard Williams <Richard.A.Williams.5@ND.edu>]

At 10:55 AM 7/18/2005 -0400, sarah smith wrote:
> Dear STATA users,
>
> I wonder how I can compare the values of a variable, say var1, at
> different observations? (In particular I want to do regressions such
> as the one below)
>
> if var1(at line 2) = var1(at line 10 ) {
>
> regress y x in 2/10
> }
>
> Thanks for suggestions,
> Sarah
Hi Sarah.  First off, better to start a new thread than to reply to an old 
one and then change the title.  But, if you do reply, at least delete all 
the material that is irrelevant to your post!

Can you clarify the goal here?  Do you want to do cases 2 through 10, then 
11 thru 19, then 20 to 28, or what?  Or do you just literally want to run a 
regression on cases 2 thru 10?  (If so, visual inspection may be easier 
than trying to program it.)

In your problem as stated, you could do

regress y x in 2/10 if var1[2]==var1[10]

But, I suspect what you want to do is more complicated than that.


-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
FAX:    (574)288-4373
HOME:   (574)289-5227
EMAIL:  Richard.A.Williams.5@ND.Edu
WWW (personal):    http://www.nd.edu/~rwilliam
WWW (department):    http://www.nd.edu/~soc

*
*   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/