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. 2021 Feb 6;47(4):1029–1038. doi: 10.1093/schbul/sbab005

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© The Author(s) 2021. Published by Oxford University Press on behalf of the Maryland Psychiatric Research Center.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Fig. 1. — Computation of the person-based similarity index.

(A) The regional imaging measures (R) of each subject are concatenated into a single vector (S) representing their imaging profile for that measure set; (B) all possible pairwise correlation coefficients between the profile (Si) of each subject and that of the other subjects are calculated; (C) the person-based similarity index (PBSI) of subject_i is the average of all pairwise correlations between subject_i and all other subjects in the same group.