when you say: just leave the 5 out and stata does not
need a balanced panel,
How do I deal with that? should I do as Nick said, "as
missing" but then do I have to do it one by one, which
one is missing and then from that.
For example, Year one; I have 7 obs: and the pid is 1
till 7.
Year two: I have only 4 because 3 did not reply so I
have 1 .3. 5. 7 but if I use the n way of assigning
pid then I will have 123 and then it will not match
the actual missing individual.
I hope I am clear.
thank you so much
--- Kit Baum <[email protected]> wrote:
> I think what is being considered here is attrition:
> certain
> individuals drop out of the panel. That is not a
> problem. Imagine
> that your panel ID is the individual's SSN (or
> social insurance
> number). What you will find is that the panel is
> unbalanced, with
> more individuals in the first wave of the survey
> than in the second,
> more in the second than the third, etc. if there is
> no replacement.
> That is a very common setup -- it happens with
> firm-level data, for
> instance, due to mergers, liquidations, etc.
>
> If you do not have preassigned ID codes for each
> individual (but
> somehow you know who is whom in each year) then just
> assign 1...N to
> the individuals in the first year, and assign the
> appropriate IDs in
> the second year, and so on. That is, if somehow you
> know that
> individual 5 has left the sample in year 2, just
> leave it out. Stata
> does not need a balanced panel.
>
> Kit Baum, Boston College Economics
> http://ideas.repec.org/e/pba1.html
>
>
> On Dec 7, 2005, at 2:33 AM, statalist-digest wrote:
>
> > But now that you are talking about obs, I have
> another
> > question:
> > when I create the panel, I assign an id to each
> > individual, but as we move through years, the
> number
> > of obs decreases so I cannot assign the same
> panelid
> > so how do we treat the missing observation?
> > Thanks for your help
> > Feno
>
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