largely uncorrelated and there is almost no role for measurement error …the role of measurement error, and the effect of selection (attrition) …

measurement error, and the effect of selection (attrition)on estimates obtained from this sample.Using time series methods … measurement error.I find that Gibrat's Law is weakly rejected for the smaller firms in mysample and accepted for the larger firms …

are outlined, followed by an extensive discussion of measurement and econometric issues that arise when estimating the … presentation of R&D spillover returns measurement. In general, the private returns to R&D are strongly positive and somewhat higher …