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Activity Number: 253
Type: Contributed
Date/Time: Tuesday, August 8, 2006 : 8:30 AM to 10:20 AM
Sponsor: Section on Survey Research Methods
Abstract - #305552
Title: Indirect Sampling and the Problem of Identification of Links
Author(s): Pierre Lavallée*+ and Xiaojian Xu
Companies: Statistics Canada and University of Alberta
Address: R.H. Coats Building, 15J, Ottawa, ON, K1A 0T6, Canada
Keywords: weighting ; over-estimation ; record linkage ; logistic regression ; calibration
Abstract:

With indirect sampling, we have two populations---UA and UB---linked where we want to produce estimates for UB. Unfortunately, we have only a sampling frame for UA. We then draw a sample from UA to produce estimates for UB using the existing correspondence (or the existing links) between the two populations. To calculate the weights relative to the units surveyed within UB, we use the generalized weight share method (GWSM) that uses the links existing between UA and UB. Unfortunately, it happens in several applications that the links between UA and UB are difficult to identify. In general, we underevaluate the number of links, which causes overestimation of totals. After an overview of the GWSM, we will present in detail the problem of links identification along with proposed solutions. We then will study the performance of each solution.

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