This paper analyzes the effect of educational mismatch on wages, using a rich panel dataset of workers in the major euro area countries from 2006 to 2009, drawn from the European Union Statistics on Income and Living Conditions (Eurostat). We use a consistent estimator to address the two...

This note discusses some aspects of the paper by Hu and Tsay (2014), "Principal Volatility Component Analysis". The key issues are considered, and are also related to existing conditional covariance and correlation models. Some caveats are given about multivariate models of time-varying...