Author Correction: Democratic classification of free-format survey responses with a network-based framework

Correction to: Nature Machine Intelligence https://doi.org/10.1038/s42256-019-0071-y, published online 9 July 2019.

In the version of this Article originally published, the σ in ‘…the set of group assignments is denoted by σ’ and equations (1) and (2) in the section ‘Materials and methods’ was incorrect; it should have been σ_i. Also, the sentence ‘The degrees of vertices can be readily obtained from A and σ’ in the same section was incorrect; it should have read ‘The degrees of vertices can be readily obtained from A’.