Fig. 4: Verification performance of single and combined tracing methods. | Communications Earth & Environment

Fig. 4: Verification performance of single and combined tracing methods.

From: Combined genetic and chemical methods boost the precision of tracing illegal timber in Central Africa

Fig. 4

41 test trees were randomly assigned an origin claim from one of our 13 sites. We then simulated two scenarios to calculate: A the percentage of correctly confirmed claims per tracing method or combination of methods, using the true origin (i.e., correct) as origin claim, and B the percentage of correctly rejected claims, where the randomly sampled claimed origin (i.e., incorrect) was used. For this second scenario, we removed the reference samples from the real origin of the test tree from the training dataset to mimic a tracing scenario. Methods are faceted by analyses based on a single method (1), a combination of two methods (2), or all three methods (3). SNP pSNPs, ISO stable isotope ratios, EL multi-element analysis, ALL all three methods, RANDOM (RDM) the percentage of correctly confirmed (A) or rejected (B) samples if assignment was completely random. For A: (1/13)*100% = 7.7%; for B (11/12)*100% = 91.7%.

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