thesis
Brazilian foreign trade : fixed and time varying parameter models
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Abstract
In this thesis we estimate and analyse several
econometric models for the Brazilian trade equations. A
major attention is given to the questions of stationarity
and parameter instability. We test for the presence of
unit roots by using the Dickey and Fuller, and Phillips
and Perron tests and the Johansen procedure, and apply a
error correction mechanism to the data. To investigate
the question of parameter instability we use the Kalman
filter in both classical and bayesian approaches and the
switching regressions technique. These tests and
estimations are performed using both annual and quarterly
disaggregated data. We show that, in some cases, the
trade equation coefficients are indeed time varying. The
changes in the trade elasticities are then related to
changes in the trade policy regime and to the industrial
structure of the economy