[3] He has published widely in the fields of macroeconomics, finance, international economics and econometrics.
He has held visiting scholar positions at several central banks and at several branches of the U.S. Federal Reserve System.
He has published widely in the fields of macroeconomics, finance, international economics and econometrics.
Administrative positions include two terms as chair of the Economics Department at the University of Wisconsin-Madison.
The estimator is used to try to overcome autocorrelation (also called serial correlation), and heteroskedasticity in the error terms in the models, often for regressions applied to time series data.