Francisco F. R. Ramos

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The main purpose of this paper is to discern the dynamic causal relationships (in the Granger (temporal) sense) among sales, advertising and prices in the context of the Portuguese car market. The present research (based on multiple cointegration tests preceded by various unit root or non-stationarity tests) is one of the first attempts at putting the(More)
This paper compares the out-of-sample forecasting accuracy of five classes of time series models for market shares of the six most important Portuguese car market competitors over different horizons. As representative time series models I employ a random walk with drift (Naive), a univariate ARIMA, a near-VAR and a general BVAR. The out-of-sample forecasts(More)
As a complementary to the existing studies of competitive market structure analysis, the present paper proposed a time series methodogy to provide a more detailed picture of marketing competition in relation to competitive market structure. Two major hypotheses were tested as part of this project. First, it was found that some significant cross-lead and lag(More)
Deadbeat-direct torque and flux control (DB-DTFC) has been emerged as a high performance digital control law for induction machines and permanent magnet machines. Its key attributes are excellent dynamic performance, the use of only one single control law over a wide torque/speed range and direct applicability to overmodulation strategies. This paper(More)
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