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The story adds point to my earlier digression that missing data,
meaning observations with missing values, and gaps in data are quite
different.

Quite independently of any Stata questions, for what -hijra- means see (e.g.)

http://en.wikipedia.org/wiki/Islamic_calendar

Nick

On Tue, Apr 5, 2011 at 8:47 AM, daniel klein
<klein.daniel.81@googlemail.com> wrote:

> Abu wrote me privately, but I will answer on statlist as suggested here:
> http://www.stata.com/support/faqs/res/statalist.html#private
>
> The "problem" is neither with -table- nor with any other command or
> option. In fact it is not a problem, but exactly what you should
> expect Stata to do. The code, that is used basicly reads:
>
> table country hijra_grp, c(sum id sum us sum count), if  hijra>1428
>
> Some countries do not appear in the table, but this is not because
> -table- drops (or omits) observations, but because the if condition is
> not satisfied for those countries. That is, there is no case in which
> hijra > 1428 for those countries in the dataset. Since your are
> telling Stata to run the command (-table- in this case) only on cases
> that satisfy the if conditon, you do not find the countries in your
> table.
>
> I do not know how to change this behaviour nor do I think you want to
> change it. Re-think the -if- statement and think of alternative ways
> to get the desired statistics.

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