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Re: st: Merge data for two panels in a panel data set


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Merge data for two panels in a panel data set
Date   Mon, 26 Mar 2012 16:59:02 +0100

That sounds like a loop over variables then. About three lines of code.

I do also agree with Eric Booth's suggestion that -collapse- is a
possibility here.

Nick

On Mon, Mar 26, 2012 at 4:54 PM, rado645-bg@yahoo.de
<rado645-bg@yahoo.de> wrote:
> Dear Nick,
>
> I have about 60 different variables over 60 quarters in a sample of 120 firms. The two firms are among those 120 firms.
>
>
> I guess it would be rather time consuming to do it in the way you suggest.


Von: Nick Cox <njcoxstata@gmail.com>

> If this is just two firms, why is the answer not item1[41] +
> item1[42], etc., where naturally you should insert the observation
> numbers relevant?

On Mon, Mar 26, 2012 at 3:35 PM, rado645-bg@yahoo.de
<rado645-bg@yahoo.de> wrote:
>
>> I have two firms in a data set that merge at a given point of time. For a specific reason, I need to sum the observations over their balance sheet items in each period of time. Would that be possible in Stata?
>>
>>
>> The dataset looks like that:
>>
>> Firm        Date    Item1    Item2    Item3
>>
>>
>> Firm1     Date1   Item1    Item2    Item3
>>
>> Firm2      Date1   Item1     Item2    Item3
>>
>> Firm3      Date1  Item1    Item2     Item3
>>
>> ...so on.
>>
>> I would like to merge in each period of time the data for firm 1 and firm 2 so the dataset will look like that:
>>
>>
>> The dataset looks like that:
>>
>> Firm                  Date     Item1  Item2  Item3
>>
>>
>> Merged_Firms    Date1  Item1  Item2  Item3
>>
>> Firm3               Date1  Item1  Item2  Item3
>>

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