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

 From Billy Schwartz <[email protected]> To [email protected] Subject Re: st: Table to count how many times an event occurs with another Date Thu, 4 Aug 2011 11:56:16 -0400

```how about -xttrans-? It gives a transition probability table (like for
a markov chain). That could show you how many times one value was
followed by another. You'd just have to reshape your data long.

On Thu, Aug 4, 2011 at 11:39 AM, Katia Bobulova
<[email protected]> wrote:
> No unfortunately it is not what I want.
>
> I am just trying to have a table showing how many times a dummy is
> released contemporaneously to each other dummy for each interval time
> through my sample.
>
> Thank you very much anyway.
>
> Katia
>
>
> 2011/8/4 MacLennan, Graeme <[email protected]>:
>> 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 <[email protected]>:
>>> 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.
>>>
>>> [email protected]
>>>
>>> On Thu, Aug 4, 2011 at 10:08 AM, Katia Bobulova
>>> <[email protected]> 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 <[email protected]>:
>>>>> Why not -tabulate-?
>>>>>
>>>>> Nick
>>>>>
>>>>> On 4 Aug 2011, at 10:52, Katia Bobulova
>>>>> <[email protected]>
>>>>> 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
>>>>>>
>>>
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```