Abstract #300245

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JSM 2003 Abstract #300245
Activity Number: 240
Type: Contributed
Date/Time: Tuesday, August 5, 2003 : 10:30 AM to 12:20 PM
Sponsor: Section on Survey Research Methods
Abstract - #300245
Title: Optimal Sample Design for National Hospital Ambulatory Medical Care Survey
Author(s): Iris M. Shimizu*+ and Feng Lan
Companies: Center for Disease Control and Prevention and National Center for Health Statistics
Address: 8513 Montpelier Dr., Laurel, MD, 20708-2307,
Keywords: sample design ; complex survey
Abstract:

The National Hospital Ambulatory Medical Care Survey (NHAMCS) has been conducted to produce ambulatory medical care service information about patient visits to the emergency departments (ED) and outpatient departments (OPD) of noninstitutional general and short-stay hospitals, exclusive of federal hospitals, located in the 50 states and the District of Columbia. The current NHAMCS uses a four-stage probability design with geographic area primary sampling units, hospitals, emergency service areas and outpatient clinics, and patient visits being selected at the respective sampling stages. The current hospital sample was first fielded in 1991-92. There are plans to replace the hospital sample in 2005 if funding becomes available. Using data from the 1999 NHAMCS and the 2001 sampling frame source, research was done to optimize the designs being considered for that new sample with the goal of maximizing precision at a fixed cost. The optimization was complicated by the requirement to produce separate survey estimates for ED visits and OPD visits while individual hospitals frequently do not have both types of departments. This paper discusses the optimization research.

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