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Measurement error in dietary assessment: an investigation using covariance structure models. Part II
1MRC Biostatistics Unit, Institute of Public Health, University Forvie Site, Cambridge, U.K.
Statistics in Medicine
|May 30, 1993
Abstract:
In Part I we presented a covariance structure model for analysing measurement error in the assessment of nitrogen intake. In this paper we include data on urine nitrogen excretion which allows a critical assessment of the model proposed. Inclusion of urine nitrogen data produces more pessimistic estimates of the quality of dietary intake measurements and shows that previous assumptions about independence of measurement error were wrong. This underscores the need for well founded assumptions in the analysis of measurement error.