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2024 | OriginalPaper | Buchkapitel

7. An Introduction to Time Series Models

verfasst von : Valérie Mignon

Erschienen in: Principles of Econometrics

Verlag: Springer Nature Switzerland

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Abstract

Time series econometrics is a branch of econometrics that has undergone many developments over the last 40 years. This chapter offers an introduction to time series models. After laying down a number of definitions, it focuses on the essential concept of stationarity. It presents the Dickey-Fuller unit root test for testing the non-stationary nature of a time series. The chapter then exposes the basic models of time series – the autoregressive moving-average models (ARMA models) – and the related Box and Jenkins methodology. A multivariate extension is proposed through the presentation of VAR (vector autoregressive) models. Finally, the concepts of non-stationary time series econometrics are presented by studying the notions of cointegration and error-correction models. Several empirical applications illustrate all the notions.

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Fußnoten
1
This chapter takes up a number of developments appearing in the work by Lardic and Mignon (2002), which interested readers may refer to for further details.
 
2
There are continuous and discrete random variables. We are only interested in discrete variables here.
 
3
For a more detailed study of stationarity and a definition of the various concepts, see in particular Lardic and Mignon (2002).
 
4
By introducing the lag operator L, we can write \(\left ( 1-L\right ) Y_{t}=\beta +\varepsilon _{t}\). If we posit \(1-L=0\), we deduce \(L=1\), hence the name of unit root.
 
5
The first-difference models allow us to reduce to usual tests of significance of the coefficients, the critical values being tabulated by Dickey and Fuller (see below).
 
6
One of the causes of error autocorrelation lies in the omission of explanatory variables. The correction provided by Dickey and Fuller thus consists in adding explanatory variables represented by the lagged values of the endogenous variable.
 
7
For robustness, we also conducted the analysis with two lags. The results are identical to those presented here.
 
8
Bartlett showed that the standard deviation is given by \(\hat {\sigma }\left ( \hat {\rho } _{h}\right ) =\left [{\frac {1}{T}}\left ( 1+2\sum \limits _{i=1}^{h-1}\hat {\rho }_{i}^{2}\right ) \right ]^{1/2}.\)
 
9
See also Akaike (1969, 1974).
 
10
It is assumed here that the constant c in the expression of the HQ criterion is equal to 1.
 
11
Strictly speaking, it is possible to estimate VAR processes in which non-stationary variables are involved using OLS. In this case, the estimators are super-consistent, but they are no longer asymptotically normal, which poses a problem for statistical inference since the usual tests can no longer be implemented.
 
12
We have assumed here that the constant c involved in the expression of the HQ criterion is equal to 1.
 
13
The data come from Robert Shiller’s website: http://​www.​econ.​yale.​edu/​~shiller/​data.​htm.
 
14
These examples are taken from the website of J. Gonzalo, Universidad Carlos III, Madrid.
 
15
Note that the cointegrating relationship can include a constant term, for example: \(Y_{t}=\alpha +\beta X_{t}.\)
 
16
We assume here that the long-term relationship includes a constant term.
 
17
In the MacKinnon table, critical values are distinguished according to whether or not a trend is included in the cointegration relationship.
 
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Metadaten
Titel
An Introduction to Time Series Models
verfasst von
Valérie Mignon
Copyright-Jahr
2024
DOI
https://doi.org/10.1007/978-3-031-52535-3_7

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