JSM 2005 - Toronto

Abstract #304290

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Activity Number: 104
Type: Contributed
Date/Time: Monday, August 8, 2005 : 8:30 AM to 10:20 AM
Sponsor: Section on Survey Research Methods
Abstract - #304290
Title: Trimming or Not To Account for Sampling Design
Author(s): Zhanyun Zhao*+ and Frank Potter
Companies: Mathematica Policy Research, Inc. and Mathematica Policy Research, Inc.
Address: 34 Central Square Park, Metuchen, NJ, 08840, United States
Keywords: trimming ; sampling design ; Upward Bound ; MSE
Abstract:

Weight trimming decreases the variance by more than enough to compensate for the potential increase in bias. However, for some surveys, the sampling design can bring variability in the weight itself. Under these circumstances, when nonresponse adjustment is applied to the weights, a decision has to be made on whether to conduct weight trimming to decrease the variance or to keep the feature of the sampling design. We investigate this problem using data from the fourth followup survey in the regular Upward Bound program. Analyses using both the trimmed weights and untrimmed weights are presented and compared.

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