Excerpt from Response Variation Encountered With Different Questionnaire Forms<br/><br/>Most research people working on problems of collecting primary data about food or other product disappearance have long been aware of the exist ence of response errors. Accurate measurement of the consumers' actions has been needed for many years; with the expansion in research about the consumer market, the problem has become more pressing. Attempts to measure response errors, however, have been primarily on an ex post facto basis. The present study represents one of the first large-scale attempts to measure response errors in a survey of food purchases with the use of an experimental design for evaluation as the primary objective of the overall project.
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