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Topic: ABS Capture/Recapture
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KINGB@WCSUB.CTSTATEU.EDU

Posts: 144
Registered: 12/6/04
ABS Capture/Recapture
Posted: Dec 28, 1996 8:20 AM
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ABS "Capture/Recapture" activity (_Student Guide_, p.126):

I did this in my first class this fall semester--as I recall, Beth Chance
suggested it--and it really was a big hit. The original fish were, I
believe, the Pepperidge Farm cheddar cheese fish; the "marked" fish were
some kind of pretzel-like fish. They need to be quite different in
appearance from the original fish.

I recommend reading Roger Johnson, "How Many Fish are in the Pond?",
_Teaching Statistics_, vol.18, no.1, Spring 1966 before doing this one.
Johnson suggests several ways to capitalize on this activity, as well as
supplying code for a Minitab "exec" macro for simulating the
capture/recapture process. Furthermore, he points out that there is
"substantial bias and variability" in the usual estimator. This was what
I emphasized in my first encounter with my students this semester: an
introduction to bias and variability; see Moore & McCabe, p.261 ff.

Extension 3 to the U.S. Census makes it clear that this is not just an
idle game.

==============================================
Bruce King
Department of Mathematics and Computer Science
Western Connecticut State University
181 White Street
Danbury, CT 06810
(kingb@wcsu.ctstateu.edu)






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