Table 3.
Predictive performance of the Classification and Regression Tree (CART) model on the learning sample (1993–1996) and validation sample (2001–2006) and their confidence intervals
|
Analysis |
ROC curve area |
Sensibility |
Specificity |
Global accuracy |
Positive predictive value |
Negative predictive value |
|---|---|---|---|---|---|---|
| % (95% CI) | % (95% CI) | % (95% CI) | % (95% CI) | % (95% CI) | % (95% CI) | |
|
CART (learning sample) |
83 |
79 |
74 |
75 |
50 |
92 |
| (79–88) |
(71–87) |
(69–78) |
(71–79) |
(42–58) |
(87–95) |
|
|
CART (validation) |
66 |
52 |
66 |
62 |
36 |
79 |
| (61–70) | (45–60) | (61–70) | (58–66) | (30–42) | (75–83) |
Teresina, Piauí, Brazil.