This paper proposes four estimators for factor GARCH models: two-stage univariate GARCH (2SUE), two-stage quasi-maximum likelihood (2SML), quasi-maximum likelihood with known factor weights (RMLE), quasi-maximum likelihood with unknown factor weights (MLE). A Monte-Carlo study is designed for...

This paper reports empirical evidence on the sensitivity of unemployment duration regression estimates to distributional assumptions and to time aggregation. The results indicate that parameter estimates are robust to distributional assumptions, while estimates of duration dependence are not....

What is the best characterization of mergers and acquisitions time-series? The traditional response is that mergers occur in "waves." I estimate a two-state, Markov switching-regime model which should capture wave structure if it is present in the data. Linear and nonlinear diagnostics tests...

The capacity of nonlinear dynamic models to mimic qualitative features of economic data is illustrated with an adaptive version of the neoclassical growth theory. Implications for econometric methodology are discussed, emphasizing structural estimation and qualitative inference. Copyright 1992...

This paper develops a test procedure for serial correlation for discrete switching disequilibrium models which include both an endogenous price adjustment equation and lagged dependent variables. The tests are applied to a model of the U.K. labor market and the model is respecified in the light...