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
interested in finding out whether the amount of information gained by
going for another wave is significant. I would greatly appreciate it if
anyone could give me a reference where similar work has been done,
preferably in the health survey area.
sowmya rao
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