Correlations between estimated and true dietary intakes: using two instrumental variables.

  title={Correlations between estimated and true dietary intakes: using two instrumental variables.},
  author={Gary E Fraser and Terrence L Butler and David J Shavlik},
  journal={Annals of epidemiology},
  volume={15 7},
PURPOSE We describe a new application of the method of triads that allows an estimate of the correlation between a dietary questionnaire measure (Q) and true intake (T). METHODS Three surrogate variables Q, M, and P are observed where M and P are both instrumental (often biological) variables. A reference dietary method (R) is not required. The variables M and P may be concentration rather than recovery biomarkers. Estimating equations produce Corr(Q,T), Corr(M,T), Corr(P,T), conditional on… CONTINUE READING

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