## Economic studies |

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### Contents

INTRODUCTION | 1 |

ON STEPWISE REGRESSION ANALYSIS | 11 |

STRUCTURAL CHANGES IN ECONOMETRIC MODELS | 24 |

3 other sections not shown

### Common terms and phrases

according to equations adjustment approximative constraints competition tariff variables computed covariance matrix degree desiderata discounted least squares distributed lag functions econometric forecasting econometric models equation sequence equations of sequence Estimated coefficients estimating the parameters ex-post forecasts ex-post predictions explanatory variables extrapolation factual influence Finland formulas four-month intervals geometric distributed GNP variable independent variables introduced inverse Kalman model least squares estimation linear constraints linear dynamic system method model building naive forecasts null hypothesis ordinary least squares polynomial assumption postal and telephone postal revenue volume postal tariff variables postal traffic predetermined variables prediction period prior information problem procedure rational distributed lag re-estimated recursive estimation regression coefficients regression equations regressors response function scheme stepwise estimation stepwise least squares stepwise regression structural changes tariff elasticities tariff raise techniques telephone revenue volume telephone traffic Terasvirta 1968 time-series traffic volume Valiaho values vector volume to changes weighting of observations zero