Paul A. Jargowsky writes:
> 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'
>
...
>
> Is this a feature or a bug?
No bug! -marksample- marks all cases without missing values. So, if you
invoke "qui tab ... if `thouse'", only cases without missing values will
be selected and the "missing"-option cannot have any effect.
(It looks to me, like you don't need the "marksample touse" line at all.
Depends on what else your program is doing.)
ben
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