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

 From Jeph Herrin To statalist@hsphsun2.harvard.edu Subject Re: st: What to do about multiple observations for one individual in one same period in a panel Date Sun, 19 Jul 2009 18:07:06 -0400

```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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