ruth@utstat.uucp (Ruth Croxford) (10/31/89)
Colloquium
Department of Statistics, University of Toronto
Topic: Controlled Sampling Designs
Speaker: J.N.K. Rao, Carlton University
Date: **Monday**, November 6, 1989 4:00 - 5:00
Place: Room 2130, Sidney Smith Hall, 100 St. George Street, U of T
Abstract:
Controlled sampling is a method of sample selection that avoids, as far
as possible, nonpreferred samples. This method received considerable attention
in recent years due to its practical importance as well as due to the possibility
of using methods of experimental designs to implement controlled sampling. Work
in this area will be reviewed and some new results on controlled probability
proportional to aggregate size (PPAS) sampling will be presented. "Optimal"
controlled sampling designs that minimize the probability of selecting a
nonpreferred sample will be given. These plans satisfy either of the following
two requirements: (1) match specified joint inclusion probabilities associated
with an uncontrolled sampling plan having certain desirable properties, (2)
provide stable non-negative unbiased variance estimators. Limitations of
methods using experimental designs will be demonstrated.
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Coffee and tea will be served in the De Lury Lounge (SS6006) at 3:30.