Abstract
This chapter addresses the problem of identifying the causal structure between two time-series processes. We focus on the setting typically encountered in econometrics, namely stationary or difference-stationary multiple autoregressive processes with additive white noise terms. We review different methods and algorithms, distinguishing between methods that filter the series through a vector autoregressive (VAR) model and methods that apply causal search directly to time series data. We also propose an additive noise model search algorithm tailored to the specific task of distinguishing among causal structures on time series pairs, under different assumptions, among which causal sufficiency.
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Notes
- 1.
When referring to “causal relationships”, we endorse here, in the spirit of Hoover [32], Pearl [55], a structural account of causality: causal relationships are the fundamental, but usually latent, building blocks of the mechanism that has generate the observed data, which we aim at representing through a structural (or causal) model. While a structural model entails probabilistic relations, it contains more information than a statistical model, because it allows us to analyze the effect of interventions (cf. [58]).
- 2.
Or, equivalently, the responses of Y t+i to forecast errors at time t.
- 3.
A vertex i is an ancestor of j if there is a sequence of directed edges (→) between i and j. A vertex i is a parent of j if i → j. A vertex i is a spouse of j (and j a spouse of i) if there is a bi-directed edge between i and j.
- 4.
- 5.
Here and below the subscript i in the function f i(⋅), as well as the superscript i in the noise term \(N_t^{\cdot ,i}\), indicate that these functions and noise terms enter in the additive noise model associated to DAG i (see Fig. 5.3).
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The authors want to thank Isabelle Guyon, Alexander Statnikov, and Daniele Marinazzo for very valuable comments on a first draft.
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Doremus, N., Moneta, A., Cattaruzzo, S. (2019). Cause-Effect Pairs in Time Series with a Focus on Econometrics. In: Guyon, I., Statnikov, A., Batu, B. (eds) Cause Effect Pairs in Machine Learning. The Springer Series on Challenges in Machine Learning. Springer, Cham. https://doi.org/10.1007/978-3-030-21810-2_5
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