Are Earnings Inequality and Mobility Overstated? The Impact of Nonclassical Measurement Error
研究了自我报告收入中的非经典测量误差如何影响不平等和流动性的度量，发现其对不平等影响大，但对流动性影响相互抵消，使调查数据与税务记录的相关性估计相似。
Measures of inequality and mobility based on self-reported earnings reflect attributes of both the joint distribution of earnings across time and the joint distribution of measurement error and earnings. While classical measurement error would increase measures of inequality and mobility, there is substantial evidence that measurement error in earnings is not classical. In this paper, we present the analytical links between nonclassical measurement error and some summary measures of inequality and mobility. The empirical importance of nonclassical measurement error is explored using the Survey of Income and Program Participation (SIPP) matched to tax records. We find that the effects of nonclassical measurement error are large. However, these nonclassical effects are largely offsetting when estimating mobility, as measured by the intertemporal correlation in earnings. As a result, SIPP estimates of the correlation are similar to estimates based on tax records, though SIPP estimates of inequality are smaller than estimates based on tax records. © 2010 The President and Fellows of Harvard College and the Massachusetts Institute of Technology.