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Re: st: Problems with expand og reverting to original dataset
From
Nick Cox <[email protected]>
To
[email protected]
Subject
Re: st: Problems with expand og reverting to original dataset
Date
Thu, 20 Jan 2011 17:40:47 +0000
There's also pertinent material within
SJ-8-4 dm0043 . Tip 71: The problem of split identity, or how to group dyads
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox
Q4/08 SJ 8(4):588--591 (no commands)
tip on how to handle dyadic identifiers
Nick
On Thu, Jan 20, 2011 at 5:30 PM, Nick Cox <[email protected]> wrote:
> Grethe:
>
> 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
> <[email protected]> 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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