Re: st: How to count countries by year

[emanuele mazzini <madsoenistata@gmail.com>]

Hi Chris,
yes, but still it results in the same number I was obtaining before.
It is curious, as it is a typical bilateral dataset (i.e. that of
Barbieri, if you know that).
Do you have any idea about where I can be wrong?

2011/3/4 emanuele mazzini <madsoenistata@gmail.com>:
> Hi there.
> I occurred in a little problem in counting the observations of my
> dataset. I have panel data and need to count how many countries are
> there for each year. I tried with the following command (assuming that
> cty1 is the name of each country):
>
> bys year: count if  cty1[_n]!= cty1[_n-1]
>
> but Stata gives a result which is not what I was expecting.
> Can anybody help?
> Thank you everyone in advance,
> Emanuele Mazzini.
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