John P. A. Ioannidis, T. D. Stanley, Hristos Doucouliagos
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We investigate two critical dimensions of the credibility of empirical economics research: statistical power and bias. We survey 159 empirical economics literatures that draw upon 64,076 estimates of economic parameters reported in more than 6,700 empirical studies. Half of the research areas have nearly 90% of their results under-powered. The median statistical power is 18%, or less. A simple weighted average of those reported results that are adequately powered (power ≥ 80%) reveals that nearly 80% of the reported effects in these empirical economics literatures are exaggerated; typically, by a factor of two and with one-third inflated by a factor of four or more.
期刊介绍：
The Economic Journal is the Royal Economic Society''s flagship title, and is one of the founding journals of modern economics. Over the past 125 years the journal has provided a platform for high quality and imaginative economic research, earning a worldwide reputation excellence as a general journal publishing papers in all fields of economics for a broad international readership. It is invaluable to anyone with an active interest in economic issues and is a key source for professional economists in higher education, business, government and the financial sector who want to keep abreast of current thinking in economics.
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