On Mon, 03 Apr 2000 14:52:58 -0400, sowmya <[EMAIL PROTECTED]> wrote:
> I'm looking for references for my thesis. I'm working with a
> longitudinal study with 4 waves of follow-up. At each wave
> non-respondents to the previous wave are followed. In health surveys,
> most of the time, non-respondents are followed as long as funding is
> available to do so. I'm interested in being able to make a decision on
> when to stop following subjects based on the amount of change in the
> point estimates that occurs by sampling the non-respondents. So I'm
I am having trouble with terminology. Or you are.
"Waves of followup" used to mean that the people who were tracked at 5
years (say) were also recorded at 10 years.
Finding the "non-respondents" is something that you do several times
in trying to complete a single *wave*. If they are not at the same
address, you look in the phone book. Then you ask their
employer/union/insurance company. Then you ask a neighbor. Then you
look for death certificates. Then you ask for whatever the Social
Security Administration may tell you, though I think that is very
little.
All of that is in one wave; and you hope that the items you are
tracking are not correlated with the difficulty of finding the people;
else, you might have to make estimates about *why* there is a
correlation.
Have you messed up the question?
--
Rich Ulrich, [EMAIL PROTECTED]
http://www.pitt.edu/~wpilib/index.html
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