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RE: st: Using tsset on panel data that are differentiated by two id variables


From   "Ben Hoen" <bhoen@lbl.gov>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Using tsset on panel data that are differentiated by two id variables
Date   Wed, 7 Nov 2012 16:45:16 -0500

Ben

Ben Hoen
LBNL
Office: 845-758-1896
Cell: 718-812-7589


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Wednesday, November 07, 2012 4:30 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Using tsset on panel data that are differentiated by two id
variables

There is a general discussion at

SJ-7-4  dm0034  . . . Stata tip 52: Generating composite categorical
variables
        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J.
Cox
        Q4/07   SJ 7(4):582--583                                 (no
commands)
        tip on how to generate categorical variables using
        tostring and egen, group()

.pdf at http://www.stata-journal.com/sjpdf.html?articlenum=dm0034

But your last remark rules that out.

So why is #2 not working? Because by default your new variable is
-float-. Make it -double- and read Bill Gould's blogs on precision
every day until memorised!

Nick

On Wed, Nov 7, 2012 at 8:35 PM, Ben Hoen <bhoen@lbl.gov> wrote:

> I have run into problems setting a set of data as panel because my panels
> are differentiated by two numeric ids (muni_code %8.0g & parcel_id %12.0g)
> both with values 1 to 999,999. For example I might have the following
cases.
>
> muni_code         parcel_id
> 22000             59
> 22000             60
> 22000             600
> 22000             601
> 27600             32199
>
> Because I cannot use a var list (at least I don't think I can) as panel
> variables in tsset, I would like to combine the variables while also
> preserving the ids so that they are both usable as a merge variable and
are
> descriptive in their values.  So, for example, I tried:
>
> 1) Using tostring to make a variable (muni_parcel_text) that looked like
> this "22000.59" "22000.60" "22000.600", "22000.601"  and "22000.5983" and
so
> on but the tsset wont accommodate a string variable
>
> 2) I then tried using the following formula .g muniparcel=(muni_id*100000)
+
> parcel_id, which I then formatted as %12.0f (.format muniparcel %12.0f)
but
> strangely got weird values such as 22000060, 2200000000, 2200000000,
> 22000000512 and 2200000512, and 2760032256, respectively.  I would have
> expected to get 22000000059, 22000000060, 22000000600, 22000000601, and
> 27600032199, respectively.
>
> Any idea how to how best to use these two variables as a panel variable,
> while preserving their values in some way?   Seperately, any idea why
option
> #2 is not resulting in the expected answer?
>
>
> FYI, for one file, I could just use .egen muniparcel=group(muni_code
> parcel_id) and use muniparcel as the panel variable, but then I would not
be
> able to merge with another dataset because the group numbers would not
> necessarily align.

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