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# Re: st: calculation 'cross differences'

 From Mario Jose To statalist@hsphsun2.harvard.edu Subject Re: st: calculation 'cross differences' Date Thu, 18 Apr 2013 16:01:46 +0100

```Many thanks Nick for the suggestion, I think it will solve my problem.

BR,
Mario

2013/4/18 Nick Cox <njcoxstata@gmail.com>:
> It seems that you want to compare each value with the means of the
> others in each group.
>
> This is an FAQ. See
>
> FAQ     . . Creating variables recording prop. of the other members of a group
>         . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
>         4/05    How do I create variables summarizing for each
>                 individual properties of the other members of a
>                 group?
> http://www.stata.com/support/faqs/data-management/creating-variables-recording-properties/
>
> Searching the archives for mentions for this FAQ may also help.
>
> Nick
> njcoxstata@gmail.com
>
>
> On 18 April 2013 11:59, Mario Jose <mariojose276@gmail.com> wrote:
>
>> I have a sample of companies that are subject to different tax rates,
>> they are owned by different parent companies. I would like to compute
>> differences of tax rates within each group and in the perspective of
>> each company. Below is an example of the database and a view of what I
>> would like to compute:
>>
>> group company  taxrate
>> 1                 A              15
>> 1                 B              10
>> 1                 C              20
>> 2                 D              20
>> 2                 E              15
>> 2                 F              14
>> 2                 G              30
>>
>> The task I need to do is calculate the following regarding for
>> instance companies A, B and C of group 1:
>>
>> A=> (15-10) + (15-20)
>> B=> (10-15) + (10-20)
>> C=> (20-15) + (20-10)
>>
>> As I have thousands of companies it is a hard to do this manually, is
>> there any suggestion on how to handle with this calculations?
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```