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发帖数: 2001 | 1 ‘Effortless Perfection:’ Do Chinese cities manipulate air pollution data?
Dalia Ghanem, Junjie Zhang,
Abstract
This paper uses unique data on daily air pollution concentrations over the
period 2001–2010 to test for manipulation in self-reported data by Chinese
cities. First, we employ a discontinuity test to detect evidence consistent
with data manipulation. Then, we propose a panel matching approach to
identify the conditions under which irregularities may occur. We find that
about 50% of cities reported dubious PM10 pollution levels that led to a
discontinuity at the cut-off. Suspicious data reporting tends to occur on
days when the anomaly is least detectable. Our findings indicate that the
official daily air pollution data are not well behaved, which provides
suggestive evidence of manipulation.
http://www.sciencedirect.com/science/article/pii/S0095069614000400 |
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