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st: SAS like command?


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: SAS like command?
Date   Wed, 17 Aug 2005 17:03:39 -0700 (PDT)

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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