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. 2017 Feb 16;41(3):626–636. doi: 10.1111/acer.13327

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Copyright © 2017 The Authors Alcoholism: Clinical & Experimental Research published by Wiley Periodicals, Inc. on behalf of Research Society on Alcoholism

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Changes in behavior over time can be represented as deltas between the induction phases. Deltas provide a robust set of features to distinguish future drinking categories. Each pair of columns represents longitudinal changes for a specific time frame between 2 categories of drinkers. Collectively, they provide a picture of how features change over time. Highlighted columns represent features automatically selected by the Random Forest classifier as contributing most toward a distinguishing classification.