Table 4 PLS-DA classification parameters obtained in the cross-validation, external validation and expanding tests.

From: Estimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by ATR-FTIR spectroscopy

 

Accuracy

Fresh bloodstain (age ≤ 1 d)

Older bloodstain (age > 1 d)

Sensitivity

Specificity

Sensitivity

Specificity

Indoor model

Cross-validation

0.99

0.99

1

1

0.99

External validation

0.99

1

0.99

0.99

1

Expanding test

0.92

0.25

1

1

0.25

Outdoor model

Cross-validation

0.96

0.96

0.96

0.96

0.96

External validation

0.99

1

0.99

0.99

1

Expanding test

0.85

0.92

0.84

0.84

0.92

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