> -----Urspr�ngliche Nachricht-----
> Von: Paul A. Jargowsky [mailto:[email protected]]
> Gesendet: Freitag, 8. August 2003 21:41
> An: [email protected]
> Betreff: st: missing data, tab ..., matcell(...) and marksample
>
>
> I have written a program to replace tabulate, but adds the ability to
> format the output, whether frequencies or row/col/cell
> percents. (Oddly,
> there isn't a way to do this in Stata. tabulate doesn't
> allow formatting
> of output, and table doesn't allow row, col, or cell percents). The
> program also organizes the output a little differently, more
> to my liking.
>
> The basic operation of the program is that "tab ...,
> matcell(X)" is invoked
> internally to produce a matrix of frequencies; these are then
> manipulated
> with matrix operations.
>
> The problem I am having concerns missing values in the row or column
> variable. I won't to be able to retain them, but when I specify the
> "missing" option to my table command, the missing
> observations are ignored.
> I have discovered that the problem is the marksample command,
> which is
> needed for byableness and ifableness. In other words, in the
> following
> code:
>
> marksample touse
> ....
> .....
> ......
> quietly tab `1' `2' [`weight' `exp'] if `touse',
> matcell(`X') matrow(`R') matcol(`C') `missing'
> .......
>
> the output matrix `X' will not have a row for the missing
> category of the
> row or column variable even if there should be one. But if I
> comment out
> "if `touse'", it works:
>
> quietly tab `1' `2' [`weight' `exp'] /* if `touse'*/,
> matcell(`X') matrow(`R') matcol(`C') `missing'
>
> Here is the output from the two versions of the do file, with
> a rigged data
> set:
>
> With "if `touse'":
> . pjt row col, col miss lines
>
> -----------------------------------------------------------
> *** row by col (Column Percents) ***
> -----------------------------------------------------------
> col
> row 1 2 3 Total
> -----------------------------------------------------------
> 1 33.3 33.3 33.3 33.3
> 2 33.3 33.3 33.3 33.3
> 3 33.3 33.3 33.3 33.3
> -----------------------------------------------------------
> Total 100.0 100.0 100.0 100.0
> -----------------------------------------------------------
>
> Without:
> . pjt row col, col lines miss
>
> --------------------------------------------------------------
> ---------
> *** row by col (Column Percents) ***
> --------------------------------------------------------------
> ---------
> col
> row 1 2 3 . Total
> --------------------------------------------------------------
> ---------
> 1 25.0 25.0 25.0 33.3 26.7
> 2 25.0 25.0 25.0 33.3 26.7
> 3 25.0 25.0 25.0 33.3 26.7
> . 25.0 25.0 25.0 0.0 20.0
> --------------------------------------------------------------
> ---------
> Total 100.0 100.0 100.0 100.0 100.0
> --------------------------------------------------------------
> ---------
>
> Is this a feature or a bug?
>
> Paul Jargowsky
>
>
>
> ==============================================================
> ===========
> Paul A. Jargowsky, Ph.D., Assoc. Prof. of Political Economy
> Director, The Bruton Center, School of Social Sciences (GR 31)
> University of Texas at Dallas, 2601 North Floyd Road,
> Richardson TX 75080
> ==============================================================
> ===========
> email: [email protected] or [email protected]
> Home page: http://www.utdallas.edu/~jargo
> Voice: 972-883-2992; FAX: 972-883-2735
> ==============================================================
> ===========
> *
> * For searches and help try:
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> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
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