期刊
CONFLICT MANAGEMENT AND PEACE SCIENCE
卷 22, 期 4, 页码 341-352出版社
PEACE SCIENCE SOC INT
DOI: 10.1080/07388940500339183
关键词
omitted variable bias; specification; control variables; research design
Quantitative political science is awash in control variables. The justification for these bloated specifications is usually the fear of omitted variable bias. A key underlying assumption is that the danger posed by omitted variable bias call be ameliorated by the inclusion of relevant control variables. Unfortunately, as this article demonstrates, there is nothing in the mathematics of regression analysis that supports this conclusion. The inclusion of additional control variables may increase or decrease the bias, and we cannot know for sure which is the case in any particular situation. A brief discussion of alternative strategies for achieving experimental con trot follows the main result.
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