Match Bias in Wage Gap Estimates Due to Earnings Imputation
发现美国当前人口调查中约30%工人的收入是插补的，导致工资差距估计偏向零，并推导了匹配偏差的表达式，以工会工资差距为例展示了偏差大小。
About 30% of workers in the Current Population Survey have earnings imputed. Wage gap estimates are biased toward zero when the attribute being studied (e.g., union status) is not a criterion used to match donors to nonrespondents. An expression for "match bias" is derived in which attenuation equals the sum of match error rates. Attenuation can be approximated by the proportion with imputed earnings. Union wage gap estimates with match bias removed are presented for 19732001. Estimates for recent years are biased downward 5 percentage points. Bias in gap estimates accompanying other nonmatch criteria (public sector, industry, etc.) is examined.