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Measurement error in dietary assessment: An investigation using covariance structure models. Part II
Author(s) -
Plummer Martyn,
Clayton David
Publication year - 1993
Publication title -
statistics in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.996
H-Index - 183
eISSN - 1097-0258
pISSN - 0277-6715
DOI - 10.1002/sim.4780121005
Subject(s) - covariance , observational error , statistics , econometrics , pessimism , analysis of covariance , computer science , independence (probability theory) , nitrogen , mathematics , chemistry , philosophy , epistemology , organic chemistry
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.