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Fredrik Johansson

6 accepted papers

2024

MINTY: Rule-based models that minimize the need for imputing features with missing values

AISTATS 2024poster

Rule models are often preferred in prediction tasks with tabular inputs as they can be easily interpreted using natural language and provide predictive performance on par with more complex models. However, most rule models’ predictions are undefined or ambiguous when some inputs are missing, forcing…

2024

Pure Exploration in Bandits with Linear Constraints

AISTATS 2024poster

We address the problem of identifying the optimal policy with a fixed confidence level in a multi-armed bandit setup, when \emph{the arms are subject to linear constraints}. Unlike the standard best-arm identification problem which is well studied, the optimal policy in this case may not be determin…

2022

Using time-series privileged information for provably efficient learning of prediction models

AISTATS 2022poster

We study prediction of future outcomes with supervised models that use privileged information during learning. The privileged information comprises samples of time series observed between the baseline time of prediction and the future outcome; this information is only available at training time whic…

2020

Characterization of Overlap in Observational Studies

AISTATS 2020poster

Overlap between treatment groups is required for non-parametric estimation of causal effects. If a subgroup of subjects always receives the same intervention, we cannot estimate the effect of intervention changes on that subgroup without further assumptions. When overlap does not hold globally, ch…

2020

Estimation of Bounds on Potential Outcomes For Decision Making

ICML 2020poster

Estimation of individual treatment effects is commonly used as the basis for contextual decision making in fields such as healthcare, education, and economics. However, it is often sufficient for the decision maker to have estimates of upper and lower bounds on the potential outcomes of decision alt…