Abstract

We recommend a major shift in the Econometrics curriculum for both graduate and undergraduate teaching. It is essential to include a range of topics that are still rarely addressed in such teaching, but are now vital for understanding and conducting empirical macroeconomic research. We focus on a new approach to macro-econometrics teaching, since even undergraduate econometrics courses must include analytical methods for time series that exhibit both evolution from stochastic trends and abrupt changes from location shifts, and so confront the “non-stationarity revolution”. The complexity and size of the resulting equation specifications, formulated to include all theory-based variables, their lags and possibly non-linear functional forms, as well as potential breaks and rival candidate variables, places model selection for models of changing economic data at the centre of teaching. To illustrate our proposed new curriculum, we draw on a large UK macroeconomics database over 1860–2011. We discuss how we reached our present approach, and how the teaching of macro-econometrics, and econometrics in general, can be improved by nesting so-called “theory-driven” and “data-driven” approaches. In our methodology, the theory-model’s parameter estimates are unaffected by selection when the theory is complete and correct, so nothing is lost, whereas when the theory is incomplete or incorrect, improved empirical models can be discovered from the data. Recent software like Autometrics facilitates both the teaching and the implementation of econometrics, supported by simulation tools to examine operational performance, designed to be feasibly presented live in the classroom.

Highlights

  • Economic theories are inevitably incomplete characterizations of the complicated reality of economic life, and empirical models based thereon are bound to be mis-specified, and are not estimating “truth”

  • We describe how the teaching of econometrics can be improved by nesting “theory-driven” and “data-driven” approaches, whereby the theorymodel’s parameter estimates are unaffected by selection when the theory is correct, whereas improved empirical models can be discovered when the theory is incorrect

  • The extremely powerful computing equipment and the sophisticated, yet easy to use, software implementing the many advances in modelling strategy that are available today mean that it is possible for empirical researchers to tackle the vast array of issues that they face in modelling economic systems

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Summary

Introduction

Economic theories are inevitably incomplete characterizations of the complicated reality of economic life, and empirical models based thereon are bound to be mis-specified, and are not estimating “truth”. Even the teaching of undergraduate econometrics must change to reflect such developments, and the “non-stationarity revolution” more generally, a theme expanded on in Hendry (2015).2 As such a formulation will usually be too large for humans to handle, and may comprise more variables, N, than available observations, T, a powerful automatic model selection procedure is essential. The extremely powerful computing equipment and the sophisticated, yet easy to use, software implementing the many advances in modelling strategy that are available today mean that it is possible for empirical researchers to tackle the vast array of issues that they face in modelling economic systems The magnitude of these developments and their success in modelling complex economic systems relative to the achievements of the widely used alternatives that pervade today’s econometrics textbooks means that it is important for there to be a major shift in both undergraduate and graduate econometrics curricula. While we mainly consider macroeconomic time series, similar principles apply to cross section and panel observational data (see e.g. Castle & Hendry, 2011, for an example)

Data generation process and its representation
Explaining the basics of exogeneity
The economic theory
Testing exogeneity
Re-simulating the model selection exercise
Conclusions
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