Using data from a Microsoft survey and the Current Population Survey, we examine the returns to Microsoft Certification in early 2000’s. The formal structure of Microsoft Certification provides a well documented external measure of computer skills rather than the ad-hoc self reports used in...

Misclassification of binary variables is the first case of non-classical measurement error considered. Similar to the classical errors-in-variables result, misclassification of a binary regressor leads to attenuation of slope coefficient estimates in linear regression. Classical instrumental...