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st: nested data


From   Natasha Sarkisian <natasha@sarkisian.net>
To   statalist@hsphsun2.harvard.edu
Subject   st: nested data
Date   Tue, 27 Sep 2005 16:36:10 -0400

Hello,

I have a nested dataset and I need advice on what types of analyses
would be appropriate to use with it.  The data are collected from groups
of siblings; in each family, each sibling answers questions regarding
each of the other siblings.  So in each family:
Obs 1  Sibling 1 rates sibling 2
Obs 2  Sibling 1 rates sibling 3
Obs 3  Sibling 2 rates sibling 1
Obs 4  Sibling 2 rates sibling 3
Obs 5  Sibling 3 rates sibling 1
Obs 6  Sibling 3 rates sibling 2

Obviously, these observations are not independent.  First of all, there
are family groups, but that's easy to deal with.  But what do I do about
the fact that siblings are rating each other?  I could make the family
to be the third level unit, individual siblings -- the second level, and
their ratings of specific "target" siblings -- the first level (i.e.
group together obs 1 and 2; obs 3 and 4; obs 5 and 6). But the lack of
independence remains with such grouping, because target siblings are the
same -- i.e. we could also group obs 1 and 6; obs 2 and 4; and obs 3 and
5. So each observation is cross-nested, but not in a typical sense of
belonging to two different types of groups on the same level (e.g.,
schools and neighborhoods, or boys and girls, etc.) -- they just belong
to two "groups" of the same type at once.  If anyone has any advice, I'd
appreciate it.

Thanks!
Natasha Sarkisian
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