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R package for performing 2-sample MR using MR-Base database
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Mendelian randomization with GWAS summary data

Travis build status Lifecycle: experimental DOI Codecov test coverage

A package for performing Mendelian randomization using GWAS summary data. It uses the IEU GWAS database to obtain data automatically, and a wide range of methods to run the analysis. You can use the MR-Base web app to try out a limited range of the functionality in this package, but for any serious work we strongly recommend using this R package.

Full documentation available here:

January 2020 major update

We have made substantial changes to the package, database and reference panels. For full details of the changes, please visit


To install the latest version of TwoSampleMR, perform as normal:


To update the package just run the install_github("MRCIEU/TwoSampleMR") command again.

We recommend using this new version going forwards but for a limited time we are enabling backwards compatibility, in case you are in the middle of analysis or need to reproduce old analysis. In order to use the legacy version of the package and the database, install using:



If using MR-Base, the IEU GWAS database or the TwoSampleMR R package:

Hemani G, Zheng J, Elsworth B, Wade KH, Baird D, Haberland V, Laurin C, Burgess S, Bowden J, Langdon R, Tan VY, Yarmolinsky J, Shihab HA, Timpson NJ, Evans DM, Relton C, Martin RM, Davey Smith G, Gaunt TR, Haycock PC, The MR-Base Collaboration.
The MR-Base platform supports systematic causal inference across the human phenome.
eLife 2018;7:e34408. doi: 10.7554/eLife.34408

If also using the MR-Steiger test:

Hemani G, Tilling K, Davey Smith G.
Orienting the causal relationship between imprecisely measured traits using GWAS summary data.
PLoS Genetics. 2017. 13(11).


This project is made available under the open source MIT license.

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