Attenuation Bias in Measuring the Wage Impact of Immigration
研究发现常用移民劳动力占比指标存在测量误差，导致估计移民对工资的影响偏小，修正后影响显著增大。
Although economic theory predicts an inverse relation between relativewages and immigration-induced supply shifts, it has been difficultto document such effects. The weak evidence may be partly due to samplingerror in a commonly used measure of the supply shift, the immigrantshare of the workforce. After controlling for permanent factors thatdetermine wages in specific labor markets, little variation remainsin the immigrant share. We find significant sampling error in thismeasure of supply shifts in Canadian and U.S. census data. Correctingfor the resulting attenuation bias can substantially increase existingestimates of the wage impact of immigration. (c) 2011 by The University of Chicago. Allrights reserved.