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. 2011 Aug 16;6(8):e22722. doi: 10.1371/journal.pone.0022722

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Nelson, Chomitz.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Top – Strict protection in Latin America and the Caribbean, with Mahalanobis matching (A) and Mahalanobis matching with calipers (B). Bottom – Multi-use protection in Africa, with Mahalanobis matching (C) and Mahalanobis matching with calipers (D).