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American Journal of Epidemiology Vol. 152, No. 12 : 1204-1206
Copyright © 2000 by The Johns Hopkins University School of Hygiene and Public Health

LETTERS TO THE EDITOR

RE: "FACTOR ANALYSIS OF SELF-REPORTED SYMPTOMS: DOES IT IDENTIFY A GULF WAR SYNDROME?"

Robert W. Haley

Division of Epidemiology Department of Internal Medicine University of Texas Southwestern Medical Center Dallas, TX 75390-8874


   INTRODUCTION
 
In a recent article, Knoke et al. (1Go) from the US Naval Health Research Center in San Diego joined other skeptics (2GoGo–4Go) in attacking our use of factor analysis to identify Gulf War syndromes (5Go) by attempting to show that symptom complexes identified by factor analysis can be found in both the deployed and nondeployed Gulf War-era veteran populations. In past letters I have countered these attacks by pointing to serious design flaws, most notably inadvertent exclusion of most veterans with the illness, use of questionnaires that measure psychiatric illnesses rather than the new illness in question, failure to include the defining symptoms, wording of questions that blur the veterans' unique symptoms with common functional symptoms, performing factor analysis on data ill-suited for that purpose, and testing factor structures with incorrect statistical . . . [Full Text of this Article]


   REFERENCES
 
Gregory C. Gray, Tyler C. Smith, Anthony W. Hawksworth and James D. Knoke

DoD Center for Deployment Health Research Naval Health Research Center San Diego, CA 92186-5122
Division of Epidemiology Department of Family and Preventive Medicine University of California, San Diego La Jolla, CA 92093


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Home page
 Am J EpidemiolHome page
S. E. Shapiro, M. R. Lasarev, and L. McCauley
Factor Analysis of Gulf War Illness: What Does It Add to Our Understanding of Possible Health Effects of Deployment?
Am. J. Epidemiol., September 15, 2002; 156(6): 578 - 585.
[Abstract] [Full Text] [PDF]

Home page
 Am J EpidemiolHome page
R. W. Haley, G. C. Gray, T. C. Smith, A. W. Hawksworth, and J. D. Knoke
RE: "FACTOR ANALYSIS OF SELF-REPORTED SYMPTOMS: DOES IT IDENTIFY A GULF WAR SYNDROME?"
Am. J. Epidemiol., December 15, 2000; 152(12): 1204 - 1206.
[Full Text] [PDF]