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RE: st: Combinations of variables
From
"Seliger Florian" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
RE: st: Combinations of variables
Date
Tue, 4 Jun 2013 15:34:49 +0000
Thank you Nick, that helped a lot.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Nick Cox
Sent: Dienstag, 4. Juni 2013 16:21
To: [email protected]
Subject: Re: st: Combinations of variables
There are several ways to get at this. One I like, for reasons easy to infer, is to use -groups- from SSC. The example here uses just two categorical variables, but having more variables is fine, just messier.
. sysuse auto, clear
(1978 Automobile Data)
. groups foreign rep78
+------------------------------------+
| foreign rep78 Freq. Percent |
|------------------------------------|
| Domestic 1 2 2.90 |
| Domestic 2 8 11.59 |
| Domestic 3 27 39.13 |
| Domestic 4 9 13.04 |
| Domestic 5 2 2.90 |
|------------------------------------|
| Foreign 3 3 4.35 |
| Foreign 4 9 13.04 |
| Foreign 5 9 13.04 |
+------------------------------------+
Note that -contract- would give you an easy answer, at the cost of destroying the dataset.
Nick
[email protected]
On 4 June 2013 15:14, Seliger Florian <[email protected]> wrote:
> I need to find the most frequent combinations of variables in my dataset.
> There are 12 variables of interest each coded 0/1.
>
> Example:
>
> ID var1 var2 var3 ..
> 1 0 1 0
> 2 0 0 1
> 3 0 1 0
> 4 1 1 1
> 5 0 1 0
> .
> .
> .
>
> In this example, the most frequent combination is var1=0, var2=1, var3=0 (for ID 1, 3, 5).
>
> At the moment, I have no idea how to find out the combinations for so many different cases automatically.
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