Causal Modeling of Policy Interventions From Treatment-Outcome Sequences

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openAccess
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Conference article in proceedings
Date
2023-07
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Language
en
Pages
35
13050-13084
Series
Proceedings of the 40th International Conference on Machine Learning, Proceedings of Machine Learning Research, Volume 202
Abstract
A treatment policy defines when and what treatments are applied to affect some outcome of interest. Data-driven decision-making requires the ability to predict what happens if a policy is changed. Existing methods that predict how the outcome evolves under different scenarios assume that the tentative sequences of future treatments are fixed in advance, while in practice the treatments are determined stochastically by a policy and may depend, for example, on the efficiency of previous treatments. Therefore, the current methods are not applicable if the treatment policy is unknown or a counterfactual analysis is needed. To handle these limitations, we model the treatments and outcomes jointly in continuous time, by combining Gaussian processes and point processes. Our model enables the estimation of a treatment policy from observational sequences of treatments and outcomes, and it can predict the interventional and counterfactual progression of the outcome after an intervention on the treatment policy (in contrast with the causal effect of a single treatment). We show with real-world and semi-synthetic data on blood glucose progression that our method can answer causal queries more accurately than existing alternatives.
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| openaire: EC/H2020/101016775/EU//INTERVENE
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Hizli , C , John , ST , Juuti , A , Saarinen , T , Pietiläinen , K & Marttinen , P 2023 , Causal Modeling of Policy Interventions From Treatment-Outcome Sequences . in A Krause , E Brunskill , K Cho , B Engelhardt , S Sabato & J Scarlett (eds) , Proceedings of the 40th International Conference on Machine Learning . Proceedings of Machine Learning Research , vol. 202 , JMLR , pp. 13050-13084 , International Conference on Machine Learning , Honolulu , Hawaii , United States , 23/07/2023 . < https://proceedings.mlr.press/v202/hizli23a.html >