Re: st: RE: Weights vs subscripts

[David Kantor <kantor.d@att.net>]

Nick Cox wrote in response to Alex Ogan's question, via a few other responses:

> [...]
>
> As the varlist contains a single variable, the
> loop is redundant here, so this boils down to
>
> replace y = y[x - 1] + z[x]
>
> The implication is that x contains
> observation numbers, in effect pointers. Is that right?
> It is a way of getting some subtle effects, or you
> might be confused.
> [...]
Maybe this was meant to be implicit in Nick's reply, but if your 
intent was really to refer to the y-value of the prior observation 
and the z of the current observation, then you should code...

 replace y = y[_n - 1] + z

More can be said about how this works, and some interesting things 
you can do with this idea, but this may not be the place for it. 
Perhaps there are some FAQs on the matter.

--David

*
*   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/