Table 4 Confusion matrix for the 2021 warning performance.

From: Analysis of rainfall response and graded warning for landslides

 

Actual landslide (yes)

Actual landslide (no)

Warning ≥ level 3

TP = 3

FP = 12

Warning ≤ level 2

FN = 0

TN = 138

  1. From this matrix, we derived the following performance metrics:
  2. True positive rate (Recall) = 3/(3 + 0) = 1.00, False positive rate = 12/(12 + 138) = 0.08, Precision = 3/(3 + 12) = 0.20, Accuracy = (3 + 138)/153 = 0.92, F1-score = 2 × (0.20 × 1.00)/(0.20 + 1.00) = 0.33.
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