In an experiment or survey, relative frequency of an event is the number of times the event occurs divided by the total number of trials. For example, if you observed \(100\) passing cars and found ...
Objective: To assess the relative validity of a semi-quantitative food frequency questionnaire (SQFFQ) against 28 day weighed diet records (WDRs). Subjects and methods: The SQFFQ was administered to ...
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