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. Author manuscript; available in PMC: 2015 Apr 15.
Published in final edited form as: Neuroimage. 2014 Jan 2;90:449–468. doi: 10.1016/j.neuroimage.2013.11.046

Table 2.

FIX classification accuracies from Human Connectome Project data.

FIX threshold 1 2 5 10 20 30 40 50
TPR (mean) 99.9 99.8 99.7 99.6 99.3 98.8 98.4 97.4
TNR (mean) 96.7 97.5 98.5 98.9 99.3 99.5 99.6 99.7
TPR (median) 100 100 100 100 100 99.0 98.8 98.0
TNR (median) 97.1 97.7 98.8 99.2 99.5 99.6 99.7 99.8

TPR = True Positive Rate, i.e., the percentage of true signals correctly classified. TNR = True Negative Rate, i.e., the percentage of true artefacts correctly classified. As the FIX “threshold” is lowered, TPR is maximised at the expense of high TNR; an “optimal” threshold might be considered to be 5–10.