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Table 3 The confusion-matrix and accuracy scores per mode, expressed as percentages, compared with manually-identified data

From: An open-source tool to identify active travel from hip-worn accelerometer, GPS and GIS data

  Observed mode Mode Positive predictive valuea Sensitivityb F1 scorec
Cycle Walk Train Vehicle Stationary
Predicted mode Cycle 3651 1426 116 215 385 Cycle 63.0 94.3 75.5
Walk 15 23,346 12 128 1858 Walk 92.1 75.6 83.0
Train 43 749 6275 89 1318 Train 74.1 96.6 83.8
Vehicle 156 585 38 23,684 3726 Vehicle 84.0 97.1 90.1
Stationary 8 4776 58 285 329,807 Stationary 98.5 97.8 98.2
  1. aPositive predictive value (PPV) or Precision, the ratio of true positives to the sum of true and false positives
  2. bSensitivity or Recall/ True positive rate/Detection rate, the ratio of true positive to true positives and false negatives
  3. cF1 score, the harmonic mean of PPV and sensitivity