[R] repeated measures setup

[Brent Pedersen]

hi, i have some data, a subset of which is pasted at the end of this message.
i am trying to understand how to do repeated measures as our study
design consists
of a subject and up to 2 siblings.

thus far, my model looks like this--with family_id indicating a
sibling relationship:

> formula = y ~ concordant + age.proband + age.other + sex.proband + sex.other + Error(family_id)

i have seen a lot of resources where this is specified as
Error(family_id/(all_other_variables)),
should that be the case here? or is the above formulation sufficient
to capture the repeated
measures by famly?

also, there seem to be a number of resources for doing this type of
analysis, is a particular package that has more traction that i should
look into?

thanks,
-brent



concordant  family_id   external_ref.proband    external_ref.other
sex.proband sex.other   age.proband age.other   y(fake)
T   58  80015550    80015543    M   F   15  19  1
F   58  80015550    80016946    M   F   15  8   2
T   54  80015499    80015338    F   F   5   7   3
F   54  80015499    80013112    F   M   5   13  4
F   22  80012269    80012252    F   F   12  10  5
F   22  80012269    80018691    F   M   12  8   5