Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/230827
Authors: 
Wang, Weining
Wooldridge, Jeffrey M.
Xu, Mengshan
Year of Publication: 
2020
Series/Report no.: 
IRTG 1792 Discussion Paper No. 2020-021
Abstract: 
Modelling dynamic conditional heteroscedasticity is the daily routine in time series econometrics. We propose a weighted conditional moment estimation to potentially improve the eciency of the QMLE (quasi maximum likelihood estimation). The weights of conditional moments are selected based on the analytical form of optimal instruments, and we nominally decide the optimal instrument based on the third and fourth moments of the underlying error term. This approach is motivated by the idea of general estimation equations (GEE). We also provide an analysis of the eciency of QMLE for the location and variance parameters. Simulations and applications are conducted to show the better performance of our estimators.
JEL: 
C00
Document Type: 
Working Paper

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