no code implementations • NeurIPS 2021 • Greg Lewis, Vasilis Syrgkanis
We consider the estimation of treatment effects in settings when multiple treatments are assigned over time and treatments can have a causal effect on future outcomes.
no code implementations • 24 Nov 2021 • Greg Lewis, Bora Ozaltun, Georgios Zervas
We discuss estimation of the differentiated products demand system of Berry et al (1995) (BLP) by maximum likelihood estimation (MLE).
no code implementations • NeurIPS 2021 • Keith Battocchi, Eleanor Dillon, Maggie Hei, Greg Lewis, Miruna Oprescu, Vasilis Syrgkanis
Policy makers typically face the problem of wanting to estimate the long-term effects of novel treatments, while only having historical data of older treatment options.
no code implementations • 12 Nov 2020 • Jiafeng Chen, Daniel L. Chen, Greg Lewis
We offer straightforward theoretical results that justify incorporating machine learning in the standard linear instrumental variable setting.
1 code implementation • NeurIPS 2020 • Nishanth Dikkala, Greg Lewis, Lester Mackey, Vasilis Syrgkanis
We develop an approach for estimating models described via conditional moment restrictions, with a prototypical application being non-parametric instrumental variable regression.
no code implementations • 17 Feb 2020 • Greg Lewis, Vasilis Syrgkanis
We consider the estimation of treatment effects in settings when multiple treatments are assigned over time and treatments can have a causal effect on future outcomes or the state of the treated unit.
2 code implementations • NeurIPS 2019 • Vasilis Syrgkanis, Victor Lei, Miruna Oprescu, Maggie Hei, Keith Battocchi, Greg Lewis
We develop a statistical learning approach to the estimation of heterogeneous effects, reducing the problem to the minimization of an appropriate loss function that depends on a set of auxiliary models (each corresponding to a separate prediction task).
1 code implementation • NeurIPS 2019 • Mert Demirer, Vasilis Syrgkanis, Greg Lewis, Victor Chernozhukov
Our results also apply if the model does not satisfy our semi-parametric form, but rather we measure regret in terms of the best projection of the true value function to this functional space.
1 code implementation • 11 Jan 2019 • Khashayar Khosravi, Greg Lewis, Vasilis Syrgkanis
We show that if the intrinsic dimension of the covariate distribution is equal to $d$, then the finite sample estimation error of our estimator is of order $n^{-1/(d+2)}$ and our estimate is $n^{1/(d+2)}$-asymptotically normal, irrespective of $D$.
1 code implementation • 19 Mar 2018 • Greg Lewis, Vasilis Syrgkanis
We provide an approach for learning deep neural net representations of models described via conditional moment restrictions.
1 code implementation • ICML 2017 • Jason Hartford, Greg Lewis, Kevin Leyton-Brown, Matt Taddy
Counterfactual prediction requires understanding causal relationships between so-called treatment and outcome variables.
no code implementations • 30 Dec 2016 • Jason Hartford, Greg Lewis, Kevin Leyton-Brown, Matt Taddy
We are in the middle of a remarkable rise in the use and capability of artificial intelligence.