Important aspects of macroeconomic modelling and
forecasting in the presence of non-stationarity are
examined in this book. Three forms of
non-stationarity are assessed: explosive,
structural-break, and unit root non-stationarity.
First, testing for unit-root non-stationarity in the
presence of explosive non-stationarity is considered.
Numerical difficulties are circumvented using
approximations before the finite-sample properties of
the unit-root test are assessed. Secondly the use of
model averaging given non-stationarity is
investigated. While model averaging can provide
competitive forecasts and parameter estimates,
selection is required, and often a single selected
model will perform best. Because averaging does not
avoid the need to select, methods of selection are
discussed. Third, regression models in the presence
of unit-root non-stationarity are estimated. Previous
empirical studies of monetary and fiscal policies
have made little reference to non-stationarity. A
cointegrated
vector-autoregressive model is used to combat this
and evidence for policy interactions is found.
forecasting in the presence of non-stationarity are
examined in this book. Three forms of
non-stationarity are assessed: explosive,
structural-break, and unit root non-stationarity.
First, testing for unit-root non-stationarity in the
presence of explosive non-stationarity is considered.
Numerical difficulties are circumvented using
approximations before the finite-sample properties of
the unit-root test are assessed. Secondly the use of
model averaging given non-stationarity is
investigated. While model averaging can provide
competitive forecasts and parameter estimates,
selection is required, and often a single selected
model will perform best. Because averaging does not
avoid the need to select, methods of selection are
discussed. Third, regression models in the presence
of unit-root non-stationarity are estimated. Previous
empirical studies of monetary and fiscal policies
have made little reference to non-stationarity. A
cointegrated
vector-autoregressive model is used to combat this
and evidence for policy interactions is found.