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Re: st: RE: SAS like command?


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: SAS like command?
Date   Wed, 17 Aug 2005 18:56:34 -0700 (PDT)

Thank you Scott. That work great. Is there an easy way
to also get the _TYPE_ variable or do I need to hard
code it?

regards,
Ricardo.


--- Scott Merryman <smerryman@kc.rr.com> wrote:

> Ricardo,
> 
> Here is oneway.  Note, it does give 27 combination,
> the combination that SAS
> does not report is (a = 1, b = 1, c = 0 ==> sum =
> 0).  I suppose you could
> add a statement to drop if sum == 0.
> 
> count
> set obs `=r(N) + 1'
> 
> tempfile results
> tempname hold
> 
> postfile `hold' a b c  freq sums using `results'
> qui {	
> levelsof a,  missing local(a)
> levelsof b, missing local(b)
> levelsof c, missing local(c)
> 
> foreach j of local a  {
> foreach k of local b  {
> foreach l of local c  {
> 	sum n if a != `j' & b !=`k' & c != `l'
> 	local sums = r(sum)
> 	local freq = r(N)
> 	local j = abs(`j' - 1) 
> 	local k = abs(`k' - 1) 
> 	local l = abs(`l' - 1) 
> 	post `hold' (`j') (`k') (`l') (`freq') (`sums')
> }
> }
> }
> }
> postclose `hold'
> preserve
> use `results', clear
> li 
> restore
> drop if a == .
> 
> 
> Hope this helps,
> Scott
> 
> 
> > -----Original Message-----
> > From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-
> > statalist@hsphsun2.harvard.edu] On Behalf Of
> Ricardo Ovaldia
> > Sent: Wednesday, August 17, 2005 7:04 PM
> > To: statalist@hsphsun2.harvard.edu
> > Subject: st: SAS like command?
> > 
> > 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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Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK

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