--Constantine Daskalakis <[email protected]> wrote:
> But as I pointed out in my original email, I HAVE updated my Stata (v7) with
>
> . update all
>
> The date showing up in my -update query- is 11 Jul 2002.
I am not sure what happened, but the error can not be reproduced here. I will
send Constantine another version to test out.
Constantine also asked:
> Currently, the -by()- option simply DISPLAYS the smoother separately for
> each group. But the smoother is the same for all groups -- estimated from
> the full dataset. What would be of interest is to allow a specification,
> where the smoother is ESTIMATED separately for each group. As it now
> stands, I have to do this manually by using the -if- option or the -use-
> command. And I can't get the various plots on one page that way (unless I
> go to the trouble of saving all the individual graphs and afterwards
> combining them manually).
Actually, the current -by()- option does estimate the smoothers separately for
each group. The following example may elaborate:
. use auto, clear
. gen x = int(uniform()*2)
. ksm for price, logit by(x) gen(sm1)
. ksm for price if x==0, logit gen(sm2)
. list sm1 sm2 if x==0
sm1 sm2
1. -.9650809 -.9650809
3. -.9808292 -.9808292
4. -.7339692 -.7339692
5. -.5306283 -.5306283
6. -.5260931 -.5260931
7. -1.021651 -1.021651
8. -.7339692 -.7339692
10. -1.098612 -1.098612
......
The smoothed values are the same from the two approaches.
Weihua Guan <[email protected]>
Stata Corp.
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