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Re: st: How to count countries by year
From
emanuele mazzini <[email protected]>
To
[email protected]
Subject
Re: st: How to count countries by year
Date
Fri, 4 Mar 2011 11:49:36 +0000
The first one works! Thank you very much Nick!
2011/3/4 Nick Cox <[email protected]>:
> If you have say -cty2- as well then the solutions may well be quite wrong. Try
>
> egen tag = tag(cty1 year)
> egen ncountry = total(tag), by(year)
>
> Otherwise show us the results of
>
> isid cty1 year
> duplicates report cty1 year
>
> Nick
>
> On Fri, Mar 4, 2011 at 11:14 AM, emanuele mazzini
> <[email protected]> wrote:
>> 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 <[email protected]>:
>>> 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.
>
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