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Activity Number: 139
Type: Contributed
Date/Time: Monday, August 5, 2013 : 8:30 AM to 10:20 AM
Sponsor: Survey Research Methods Section
Abstract - #308705
Title: Estimating the Variance of a Two-Phase Estimator with Sudaan 11
Author(s): Dhuly Chowdhury*+ and Phil Kott
Companies: RTI International and RTI International
Keywords: SUDAAN 11 ; two-phase sampling ; variance estimation ; reweighting expansion estimator

Suppose we drew a large stratified simple random sample, then based on information provided from that sample re-stratified the sample and drew a smaller subsample from which a more detailed set of variables was collected. This is an example of a two-phase sampling design. Two-phase sampling is becoming an increasingly popular sample-selection procedure. We will use the WTADJX procedure in SUDAAN 11 to estimate the variance of a reweighting expansion estimator based on data collected under the two-phase design described above. We will compare our approach to variance estimation with alternative methods sometimes used when software like SUDAAN 11 is not available.

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