Pesticide Use during the Gulf War: A Survey of Gulf War Veterans

By Ronald D. Fricker Jr.; Elaine Reardon et al. | Go to book overview

Appendix C
ANALYTIC METHODS

SAMPLE (ANALYTIC) WEIGHTS

The survey sample was weighted to account for the differential probability of being sampled among strata, for nonresponse, and for respondent ineligibility. These statistical adjustments allow the analysis to properly infer back to the correct Gulf War population. The calculations were done as follows.

Respondents were randomly sampled within strata. For a predetermined number of respondents to be drawn from strata j, nj,

where Nj is the total number of persons in strata j in the sampling frame. In the absence of nonresponse and ineligibility issues, the weight for person i in strata j would simply be Wi = Nj/nj However, nonresponse and ineligibility affect nj and Nj, respectively, and they must be adjusted to arrive at weights that will allow proper inference back to the population of interest.

Nonresponse1 was accounted for using the propensity score method of Little and Rubin (1987) to determine the probability that person i responds given that person i was sampled. This probability was calculated by fitting the logistic regression model

____________________
1
“Nonresponse” as used in this appendix includes those who refused to participate and those who were not located—essentially everyone in the sampling frame who did not complete the survey, minus those who were ineligible.

-95-

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Pesticide Use during the Gulf War: A Survey of Gulf War Veterans
Table of contents

Table of contents

  • Title Page *
  • Preface v
  • Contents vii
  • Figures ix
  • Table xi
  • Summary xv
  • Acknowledgments xxvii
  • Acronyms xxix
  • A Note on Trade Names xxxi
  • Chapter One - Introduction 1
  • Chapter Two - Survey and Sample Description 7
  • Chapter Three - Survey Results 19
  • Chapter Four - Living Conditions and Variations in Pesticide Use 43
  • Chapter Five - Potential Misuse or Overuse of Pesticides 57
  • Appendix A - Main Survey Instrument 69
  • Appendix B - Definition of the Sampling Frame and Sample 75
  • Appendix C - Analytic Methods 95
  • Appendix D - Evaluating Recall Bias 107
  • References 117
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