RE: st: How to list all the observation meeting the conditions which are the former results?

[Grace Jessie <gracejessie@hotmail.com>]

Thank you for reply.
It seems the problem has not been solved.
I do not want to list all the observations meeting "z<5".
Firstly, I get the combination of x and y appearing in the results of "z<5". Then I want to list all the observations with the combination of x and y, maybe in the current data or in another data.
In my firt posting,
"I know -levelsof- can solve the problem if not the combination but just one variable."
For example,
levelsof x if z<5,loc(a)
foreach i of loc a {
l if x==`i'
}
Now I doubt if not a variable but a combination (such as two variables),
how to do it?
Grace


----------------------------------------
> From: eric.de_souza@coleurope.eu
> To: statalist@hsphsun2.harvard.edu
> Date: Sun, 12 Dec 2010 15:13:40 +0100
> Subject: RE: st: How to list all the observation meeting the conditions which are the former results?
>
> input x y z
> ....
> gen id = _n
> l
> preserve
> keep if z<5
> l
> restore
>
> This way you have the observation numbers in the original dataset
>
> Or do you want something else?
>
> Eric de Souza
> College of Europe
> BE-8000 Brugge (Bruges)
> Belgium
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Grace Jessie
> Sent: 12 December 2010 13:46
> To: statalist@hsphsun2.harvard.edu
> Subject: st: How to list all the observation meeting the conditions which are the former results?
>
> Dear statalists,
> How to list all the observation meeting the conditions which are the former results?
> For example,
> . clear
> . input x y z
> x y z
> 1. 1 2 8
> 2. 1 2 2
> 3. 2 3 4
> 4. 2 3 9
> 5. 2 4 8
> 6. end
> . l
> +-----------+
> | x y z |
> |-----------|
> 1. | 1 2 8 |
> 2. | 1 2 2 |
> 3. | 2 3 4 |
> 4. | 2 3 9 |
> 5. | 2 4 8 |
> +-----------+
> . l if z<5
> +-----------+
> | x y z |
> |-----------|
> 2. | 1 2 2 |
> 3. | 2 3 4 |
> +-----------+
> Now I want to list all the observations for each x and y combination in the former results,i.e.,(x==1 & y==2) | (x==2 | y==3).
> I know I can type "l if (x==1 & y==2) | (x==2 | y==3)".
> However, typing one by one is troublesome if the number of the combinations for the former results is large.
> I know -levelsof- can solve the problem if not the combination but just one variable.
> Is there a way like -levelsof- ?
> Thank you!
> Grace
>
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