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Table 2 Binary Classification Performance Measures

From: Nonlinear Heart Rate Variability features for real-life stress detection. Case study: students under stress due to university examination

Measure Abbreviation Formulae
Total classification accuracy ACC T P + T N T P + T N + F P + F N
Sensitivity SEN T P T P + F N
Specificity SPE T N F P + T N
Positive Predictive Value PPV T P T P + F P
Negative Predictive Value NPV T N T N + F N
  1. TP: the number of records performed during university examination correctly detected
  2. TN: the number of records performed on holidays correctly detected
  3. FP: the number of records performed on holidays incorrectly labelled as during university examination
  4. FN: the number of records performed during university examination incorrectly labelled as on holidays.