The R package DoubleML provides an implementation of the double / debiased machine learning framework of Chernozhukov et al. (2018). It is built on top of mlr3 and the mlr3 ecosystem (Lang et al., 2019).

Note that the R package was developed together with a python twin based on scikit-learn. The python package is also available on GitHub and .

## Documentation and maintenance

Documentation of functions in R: https://docs.doubleml.org/r/stable/reference/index.html

User guide: https://docs.doubleml.org

DoubleML is currently maintained by @MalteKurz and @PhilippBach.

## Main Features

Double / debiased machine learning framework of Chernozhukov et al. (2018) for

• Partially linear regression models (PLR)
• Partially linear IV regression models (PLIV)
• Interactive regression models (IRM)
• Interactive IV regression models (IIVM)

The object-oriented implementation of DoubleML that is based on the R6 package for R is very flexible. The model classes DoubleMLPLR, DoubleMLPLIV, DoubleMLIRM and DoubleIIVM implement the estimation of the nuisance functions via machine learning methods and the computation of the Neyman orthogonal score function. All other functionalities are implemented in the abstract base class DoubleML. In particular functionalities to estimate double machine learning models and to perform statistical inference via the methods fit, bootstrap, confint, p_adjust and tune. This object-oriented implementation allows a high flexibility for the model specification in terms of …

• … the machine learning methods for estimation of the nuisance functions,
• … the resampling schemes,
• … the double machine learning algorithm,
• … the Neyman orthogonal score functions,

It further can be readily extended with regards to

• … new model classes that come with Neyman orthogonal score functions being linear in the target parameter,
• … alternative score functions via callables,
• … alternative resampling schemes,

## Installation

Install the latest release from CRAN:

remotes::packages("DoubleML")

Install the development version from GitHub:

remotes::install_github("DoubleML/doubleml-for-r")

DoubleML requires

• R (>= 3.5.0)
• R6 (>= 2.4.1)
• data.table (>= 1.12.8)
• stats
• checkmate
• mlr3 (>= 0.5.0)
• mlr3tuning (>= 0.3.0)
• mlr3learners (>= 0.3.0)
• mvtnorm
• utils
• clusterGeneration

## Citation

If you use the DoubleML package a citation is highly appreciated:

Bach, P., Chernozhukov, V., Kurz, M. S., and Spindler, M. (2021), DoubleML - An Object-Oriented Implementation of Double Machine Learning in R, arXiv:2103.09603.

Bibtex-entry:

@misc{DoubleML2020,
title={{DoubleML} -- {A}n Object-Oriented Implementation of Double Machine Learning in {R}},
author={P. Bach and V. Chernozhukov and M. S. Kurz and M. Spindler},
year={2021},
eprint={2103.09603},
archivePrefix={arXiv},
primaryClass={stat.ML},
note={arXiv:\href{https://arxiv.org/abs/2103.09603}{2103.09603} [stat.ML]}
}

## References

• Chernozhukov, V., Chetverikov, D., Demirer, M., Duflo, E., Hansen, C., Newey, W. and Robins, J. (2018), Double/debiased machine learning for treatment and structural parameters. The Econometrics Journal, 21: C1-C68, https://doi.org/10.1111/ectj.12097.

• Lang, M., Binder, M., Richter, J., Schratz, P., Pfisterer, F., Coors, S., Au, Q., Casalicchio, G., Kotthoff, L., Bischl, B. (2019), mlr3: A modern object-oriented machine learing framework in R. Journal of Open Source Software, https://doi.org/10.21105/joss.01903.