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Re: st: SAS like command?


From   James Muller <james.muller@internode.on.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: SAS like command?
Date   Thu, 18 Aug 2005 10:51:49 +1000

Here's a rough procedure:

Start with your dataset. Choose the variables you want to keep, suppose these are variables a, b and c
. bysort a b c: egen tabulation = sum(1)
. duplicates drop
Then you should have the below table as your new dataset.

Here's a simple example program that will simply output the data. If you're going to use this frequently, save it as tabNway.ado and put it in your adopath.

program define tabNway
preserve
keep `*'
sort`*'
by `*': egen tabcount = sum(1)
duplicates drop
list
restore
end

In your case you would use input 'tabNway a b c'. I didn't use a tempvar because that gives a meaningless heading in the list. To get your other heading you can edit the program.

Cheers

James



Ricardo Ovaldia wrote:


Dear all,

SAS's proc mean with the class command expands the
class variables creating all possible combinations
including data with missing data. Is there a way to
do this in Stata?

Thank you,
Ricardo.

Example:

Starting with these data:

Obs a b c n

1 0 0 0 3
2 0 0 1 4
3 0 1 1 5
4 1 1 1 10
5 0 1 0 7
6 0 1 1 5
7 1 0 0 8
8 1 0 1 9

The SAS command:

proc means;
class a b c;
var n;
output sum=tsum ;

Yields:


Obs a b c _TYPE_ _FREQ_ tsum
1 . . . 0 8 51
2 . . 0 1 3 18
3 . . 1 1 5 33
4 . 0 . 2 4 24
5 . 1 . 2 4 27
6 . 0 0 3 2 11
7 . 0 1 3 2 13
8 . 1 0 3 1 7
9 . 1 1 3 3 20
10 0 . . 4 5 24
11 1 . . 4 3 27
12 0 . 0 5 2 10
13 0 . 1 5 3 14
14 1 . 0 5 1 8
15 1 . 1 5 2 19
16 0 0 . 6 2 7
17 0 1 . 6 3 17
18 1 0 . 6 2 17
19 1 1 . 6 1 10
20 0 0 0 7 1 3
21 0 0 1 7 1 4
22 0 1 0 7 1 7
23 0 1 1 7 2 10
24 1 0 0 7 1 8
25 1 0 1 7 1 9
26 1 1 1 7 1 10


Ricardo Ovaldia, MS
Statistician Oklahoma City, OK



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