Table 3.
Pairwise models: parameter estimators, standard deviations and p-values from the likelihood ratio test statistics for full and conditional likelihood methods for the dementia study
| Vascular vs. probable | Vascular vs. possible | Probable vs. possible | ||||
|---|---|---|---|---|---|---|
| Full | Conditional | Full | Conditional | Full | Conditional | |
| γ(t) = t | ||||||
| α̂u(sd) | 0.09 (0.11) | 0.11 (0.15) | 0.24 (0.10) | 0.25 (0.14) | 0.19 (0.09) | 0.18 (0.13) |
| β̂(sd) | −0.02 (0.02) | −0.02 (0.03) | −0.05 (0.02) | −0.05 (0.03) | −0.04 (0.02) | −0.03 (0.02) |
| p-value | 0.32 | 0.37 | 0.01 | 0.06 | 0.03 | 0.13 |
| γ(t) = log(t) | ||||||
| α̂u(sd) | 0.29 (0.18) | 0.34 (0.21) | 0.50 (0.20) | 0.52 (0.24) | 0.26 (0.17) | 0.21 (0.20) |
| β̂(sd) | −0.24 (0.14) | −0.27 (0.17) | −0.39 (0.15) | −0.39 (0.17) | −0.19 (0.12) | −0.15 (0.14) |
| p-value | 0.08 | 0.09 | 0.01 | 0.02 | 0.13 | 0.29 |
Possible, possible Alzheimer’s disease; Probable, probable Alzheimer’s disease; p-value, conditional likelihood ratio test Rc or full likelihood ratio test Rf for assessing the equality of two survival distributions; sd, standard deviation.