This paper examines the properties and prevalence of measurement error in longitudinal earnings data.The analysis compares Current Population Survey data to administrative Social Security payroll tax records for a sample of heads of households over two years.In contrast.to the typically assumed properties of measurement error, the results indicate that errors are serially correlated over two years and negatively correlated with true earnings (i.e., mean reverting).Moreover, reported earnings are more reliable for females than males.Overall, the ratio of the variance of the signal to the total variance is .82for men and .92for women.These ratios fall to .65 and .81when the data are specified in first-differences.The estimates suggest that longitudinal earnings data may be more reliable than previously believed.
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