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Re: st: Panel data correlation


From   Anderson Macedo de Jesus <andemacj@me.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Panel data correlation
Date   Tue, 01 Apr 2014 20:06:51 +0200

Thanks a lot, Elan
Very helpful.
Thats why I asked.
I will check and let you know about the results
Anderson


On Apr 1, 2014, at 8:02 PM, Cohen, Elan <cohened@upmc.edu> wrote:

> This is my guess.  Anderson would like to look at the correlation across years, but -correlate- isn't structured to handle data in long format.  Hence, we need to -reshape wide-.
> 
> reshape wide CA PFI, i(country) j(years)
> corr CA*
> corr PFI*
> 
> The above code has not been tested.  Hope this helps.
> 
> - Elan
> 
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: Tuesday, April 01, 2014 13:50
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: Panel data correlation
> 
> Sorry, but I can't add to my previous answer as I don't think you are
> posing a precise question.
> 
> What's different may be what makes sense to your project, but pooling
> countries and years just mixes different kinds of variation and would
> produce something difficult to interpret. The point is usually made in
> broader discussions of cross-sectional and panel analyses.
> Nick
> njcoxstata@gmail.com
> 
> 
> On 1 April 2014 18:43, Anderson Macedo de Jesus <andemacj@me.com> wrote:
>> Nick,
>> I have two variables and I need to check the correlation between them in a panel data, but I have a panel data for 135 countries described as follows:
>> 
>> countries                       years           CA              PFI
>> Brazil                  1990            12              20
>> Brazil                  1995            10              5
>> Brazil                  2000            40              1
>> Brazil                  2005            4               40
>> Brazil                  2010            20              30
>> Netherlands             1990            100             30
>> ...
>> 
>> I have been dealing with these data for a while and I could notice that it is a bit different to deal with panel data. So, I would like to know whether or not I can use the simple -correlate- command or there is something different. Thats my question. I don't want to make a big mistake
>> Thanks
>> Anderson
>> 
>> 
>> On Apr 1, 2014, at 7:31 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>> 
>>> The Pearson correlation between two variables can be calculated with
>>> -correlate-. You could restrict that to different years or even
>>> different countries, although I wouldn't pay anything for correlations
>>> based on 5 values. So, what's the precise question?
>>> 
>>> Nick
>>> njcoxstata@gmail.com
>>> 
>>> 
>>> On 1 April 2014 18:25, Anderson Macedo de Jesus <andemacj@me.com> wrote:
>>> 
>>>> I need to check the correlation btw two variables in a panel data in a long format (135 countries with 5 different years for each variable). How can I do that?
>>>> As I could realize it is not possible to run the pearson correlation, right? So, I could I do that?
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