Re: st: Problems with expand og reverting to original dataset

[Nick Cox <njcoxstata@gmail.com>]

I can't see that the code I gave you would produce that error message.
Somewhere in what you typed there is a period or stop . which should
not be included, or so I guess.

Ada's "correction" of my code is incorrect. I meant what I said.

Nick


On Thu, Jan 20, 2011 at 2:12 PM, Grethe Søndergaard
<dkstatstata@gmail.com> wrote:
> Thank you for your answers
>
> @ Nick Cox: I have tried to run bysort mother_id father_id
> (birth_date) : gen diff = birth_date[2] -birth_date[1]. However, an
> error message appear: "factor variables and time-series operators not
> allowed". Can I solve this problem - by somehow changing the type of
> variable that birth_date is?
>
> @ Ada Ma: My dataset consists of more than two siblings per family
> (one line for each person). I am not sure how to find out which
> siblings to be included in the dataset, if more than two siblings are
> being compared. E.g. a family consists of children age 1, 4, and 8 (so
> who should stay in the dataset). So that is why I choose only to
> include persons with one siblings.
>

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