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J Am Med Inform Assoc 15:227-234 doi:10.1197/jamia.M2493
  • Original Investigation

Individual and Joint Expert Judgments as Reference Standards in Artifact Detection

Table 5

Internal Validity of Artifact Filters Developed Using Joint Standards

Majority Vote Consensus
Variable Filtering Method Sensitivity PPV Sensitivity PPV
ABPm Median filtering 0.44 (0.29–0.59) 0.91 (0.71–0.99) 0.67 (0.47–0.83) 0.91 (0.71–0.99)
ArtiDetect 0.52 (0.37–0.67) 0.86 (0.67–0.96) 0.77 (0.58–0.90) 0.64 (0.46–0.79)
Tree induction 0.67 (0.52–0.81) 0.84 (0.72–0.92) 0.60 (0.41–0.77) 0.69 (0.48–0.86)
CVP Median filtering 0.85 (0.75–0.93) 0.74 (0.63–0.84) 0.87 (0.77–0.94) 0.71 (0.60–0.80)
ArtiDetect 0.88 (0.78–0.95) 0.87 (0.77–0.94) 0.84 (0.74–0.92) 0.97 (0.89–1.00)
Tree induction 0.77 (0.65–0.86) 0.83 (0.71–0.91) 0.73 (0.52–0.81) 0.84 (0.68–0.94)
HR Median filtering 0.89 (0.70–0.98) 0.79 (0.60–0.92) 0.54 (0.39–0.69) 0.86 (0.80–1.00)
ArtiDetect 0.27 (0.12–0.48) 1.00 (0.59–1.00) 0.33 (0.20–0.48) 0.63 (0.41–0.81)
Tree induction 0.65 (0.44–0.83) 0.74 (0.52–0.90) 0.57 (0.41–0.71) 0.65 (0.50–0.78)

  • The performance is quantified in terms of the 10-fold cross-validated sensitivity and positive predictive value (PPV) in the set of time series (95% confidence interval).

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