The frequency of CSF diversion surgery and the predicted frequency by stepwise logistic regressiona
| Observed | Predicted | % Correct | |
|---|---|---|---|
| Yes | No | ||
| Yes | 11 | 3 | 78.6 |
| No | 2 | 17 | 89.5 |
| Overall % correct | 84.8 | ||
↵a Cutoff = 0.5; sensitivity = 11/(11 + 3) = 78.6%; specificity = 17/(2 + 17) = 89.5%; false-positive = 2/(2 + 17) = 10.5%; false-negative = 3/(11 + 3) = 21.4%.