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Activity Number: 571
Type: Contributed
Date/Time: Thursday, August 6, 2009 : 8:30 AM to 10:20 AM
Sponsor: Section on Survey Research Methods
Abstract - #305399
Title: Evaluation of Methods for Increasing Precision in DAWN: Stratification and Ratio Estimation
Author(s): Peter Frechtel*+
Companies: RTI International
Address: 701 13th Street NW, Washington, DC, 20005,
Keywords: ratio estimation ; establishment surveys ; stratification
Abstract:

The primary goal of the Drug Abuse Warning Network (DAWN) survey is to estimate the number of US emergency department (ED) visits involving drugs. These estimates are reported at the national level as well as for a small number of metropolitan areas. Two main statistical methods are used to improve the precision of the survey: stratification and ratio estimation. For stratification, within metropolitan areas, hospitals are assigned to ownership (public vs. private) and size categories (based on the total number of ED visits). For ratio estimation, the denominator is always the total number of ED visits. In this presentation, the efficacy of these two methods will be assessed. An alternative stratification scheme will be examined, and standard errors generated using no auxiliary information will be compared to those generated using ratio estimation.

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