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RE: st: Table to count how many times an event occurs with another


From   "MacLennan, Graeme" <g.maclennan@abdn.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Table to count how many times an event occurs with another
Date   Thu, 4 Aug 2011 16:29:34 +0100

If you have only four dummies then:

*** example begin***
gen d1d2d3d4 =  D1*1000 + D2*100 + D3*10 + D4
tab d1d2d3d4
*** example end***

Might do what you want?
Graeme

********
This is an example of my databse:

Date              Time      D1 D2 D3 D4
01/01/2008     8:00       1   0    0   1
01/01/2008     9:00       0   0    0   0
01/01/2008    10:00      0   1    1   0
.....               .......       .    .     .   .

For every day I have something similar to the above example with dummy variables.
In the fist row (8:30) I have that two dummies happen at the same time and also in the last row (10:00).
I want to construct a table, in which I have the number of times ( for each interval throughout my whole sample) I have that events D1 and D4 happen together and D2 and D3 happen together and so on for all possible combinations.

Thanks,
Katia





2011/8/4 Anders Alexandersson <andersalex@gmail.com>:
> Please provide the original example data of the 4 events and 10
> observations from which you want to create the table.
> The reason I ask is that I do not understand your provided 4*4 table.
>
> Anders Alexandersson
> andersalex@gmail.com
>
> On Thu, Aug 4, 2011 at 10:08 AM, Katia Bobulova
> <katia.bobulova@googlemail.com> wrote:
>> Because it doesn't do what I want and anyway it is not possible to
>> use tabulate with more than two variables.
>>
>> Katia
>>
>> 2011/8/4 Nick Cox <njcoxstata@gmail.com>:
>>> Why not -tabulate-?
>>>
>>> Nick
>>>
>>> On 4 Aug 2011, at 10:52, Katia Bobulova
>>> <katia.bobulova@googlemail.com>
>>> wrote:
>>>
>>>> Dear All,
>>>>
>>>> I have many events in my dataset and I want to count how many times
>>>> one event happens with another one.
>>>>
>>>> Assuming fro example 4 events and ten observations, I would like to
>>>> have a table like this:
>>>>
>>>>    x1 x2 x3 x4
>>>> x1  10  2   1  3
>>>> x2  1  10  0   0
>>>> x3  0  3   10  1
>>>> x4 2   5   0   10
>>>>
>>>> Could you please help me?
>
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