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Am J Public Health. 1999 August; 89(8): 1175–1180. | PMCID: PMC1508697 |
The right answer for the wrong question: consequences of type III error for public health research. S Schwartz and K M Carpenter Joseph L. Mailman School of Public Health, Columbia University, New York, NY 10032, USA. sbs5@columbia.edu Abstract OBJECTIVES: This study examined the impact of assessing the causes of interindividual variation within a population when the research question of interest is about causes of differences between populations or time periods. This discrepancy between the research focus and the research question is referred to as a type III error, one that provides the right answer for the wrong question. METHODS: Homelessness, obesity, and infant mortality were used to illustrate different consequences of type III errors. These different consequences depend on the relationships between the causes of within- and between-group variation. CONCLUSIONS: The causes of inter-individual variation and the causes of variation between populations and time periods may be distinct. The problem of examining invariant causes deserves attention. Full text Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the complete article (1.9M), or click on a page image below to browse page by page. Links to PubMed are also available for Selected References. These references are in PubMed. This may not be the complete list of references from this article. - Susser M. What is a cause and how do we know one? A grammar for pragmatic epidemiology. Am J Epidemiol. 1991 Apr 1;133(7):635–648. [PubMed]
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