Everyone is a husband or a wife right? So ageofwife is missing for all
husbands, therefore all those cases are dropped. Ageofhusband is
missing for all wives, so you lose the rest of the cases.....
On Fri, 7 Mar 2008, Nirina F wrote:
> Dear Nick,
>
> Thank you for taking the time to respond. I understand what you mean but
>
> actually, what I meant was that if I run
>
> "reg income ageofwife ageofhusband schoolingofwife schoolingofhusband "
>
> it gives me 0 observation because of how the explanatory variables
> were generated:
>
> ageofwife=age if wife==1
> ageofhusband=age if husband==1
>
> then used together ends up in intersection and here comes my problem.
>
> Nirina
>
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