CPES logoCollaborative Psychiatric
Epidemiology Surveys

I. Introduction

Under contract to the National Institutes of Mental Health (NIMH), the Survey Research Center (SRC) has developed an integrated data base for the Collaborative Psychiatric Epidemiology (CPES) surveys: National Comorbidity Survey-Replication (NCS-R), National Survey of American Life (NSAL) and National Latino and Asian American Study (NLAAS). Heeringa, et al (2004) describe the sample designs and sample outcomes for the three CPES surveys. A general description of the survey methodology for the CPES surveys can be found in Pennell, et al. (2004).

This technical report outlines the method for integrating the design-based analysis weights and variance estimation codes for these three studies to permit analysts to approach analysis of the combined dataset as though it were a single, nationally-representative study.

The method of integrating the analysis of these three major survey programs was based on an adaptation of a multiple frame approach to estimation and inference for population characteristics (Hartley, 1962, 1974). There are several features and advantages to the method that are worth noting:

  1. It was built on all of the study-specific weight development efforts conducted to date (Kessler et al. , 2004; Heeringa et al. 2004; Heeringa, et al. 2006).

  2. It integrated overlapping representation of domains of the CPES survey population in a way that was mathematically transparent and easily understood by analysts of the combined data set. Given the large investments in study-specific weight development, this approach minimized the chance for conceptual or computational errors.

  3. It was centered on the assumption that, conditional on the sample domain (e.g., block groups with 10-29.9% African American population) and the race/ethnicity of the respondent (e.g., Mexican-American), each study's sample representation based on the revised weight is proportional to the number of cases it "contributes" to the geographic domain x race/ethnicity cell.