Re: st: What to do about multiple observations for one individual in one same period in a panel

[Jeph Herrin <junk@spandrel.net>]

You don't say what kind of analysis you have in mind, so it's very
hard to know how to handle it. However, if you are thinking of models,
I would treat this as nested panels, which -xtmixed- and -xtmelogit-,
among others, can handle.

eg, if you have -country-, -quarter-, a continuous outcome -depvar-,
and some independent variables <indvars>

 xtmixed depvar <indvars> || country: || quarter:

would account for multiple obs per quarter, and multiple quarters per
country. Though maybe I'm missing something.

hth,
Jeph



kokootchke wrote:
> Do you guys know what one can do about multiple observations for one individual in one same period in a panel? 
>
> A standard panel would be like this (with a bunch of other variables that are unique for that individual country and time period):
>
> Argentina   1990:1
> Argentina   1990:2
> Argentina   1990:3
> Argentina   1990:4
> Argentina   1991:1
> ...
> Argentina   2008:3
> Argentina   2008:4
> Brazil      1990:1
> Brazil      1990:2
> Brazil      1990:3
> ...
> Brazil      2008:3
>
> Brazil      2008:4
> Colombia    1990:1
> Colombia    1990:2
> Colombia    1990:3
> ...
> ...
>
> Now, imagine I have the following:
>
>
> Argentina   1990:1
> Argentina   1990:1
> Argentina   1990:1
> Argentina   1990:2
> Argentina   1990:3
>
> Argentina   1990:4
> Argentina   1990:4
> Argentina   1990:4
> Argentina   1990:4
>
> Argentina   1991:1
> Argentina   1991:1
>
> ...
>
> Argentina   2008:3
>
> Argentina   2008:4
> Argentina   2008:4
>
> Brazil      1990:1
>
> Brazil      1990:2
> Brazil      1990:2
>
> Brazil      1990:3
> Brazil      1990:3
> Brazil      1990:3
> Brazil      1990:3
>
> ...
>
> ...
>
> You see the difference? Suppose that for each repeated individual (country) and time period, I have different measurings of some variable. 
>
> More specifically, my problem is one of selection in which countries don't issue debt bonds in some periods, but when they do issue, they may issue MULTIPLE bonds, each with a different price, etc.
>
> What can I do about this?
>
> Thank you very much in advance!
>
> Regards,
> Adrian
>
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