what do you mean by 'gain in information'? WHAT information? i assume on
this survey ... there are many items ... are some more important to get
information on than others? what is it that you are shooting for ...
what information do you already have? has it answered the questions that
you posed initially? you have to think about whether you have sufficient
information already ... and NOT so much about whether the extra Ss gain you
statistical 'significance'
finally, if you are able to send followups ... then you have the ability to
see how your current sample compares to the ones who have NOT sent in their
forms ... so, i would suggest that a better issue to focus on would be how
representative the current sample is compared to the total that you
originally sent surveys to
At 02:52 PM 4/3/00 -0400, sowmya 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
>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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