Table 5.
Effect of training and test set sizes on the power for Model A
| Training: Test |
Single Group Analysis |
High- versus Low-Risk Group Analysis |
|
|---|---|---|---|
| Cox Model I | Cox Model II | Log-rank test | |
| 78:19 |
0.3945 |
0.2623 |
0.2819 |
| 65:32 |
0.6000 |
0.4164 |
0.4312 |
| 49:48* |
0.7630 |
0.5032 |
0.5164 |
| 32:65 |
0.7746 |
0.5226 |
0.5294 |
| 25:72 |
0.7042 |
0.5166 |
0.5232 |
| 19:78 | 0.563 | 0.4058 | 0.412 |
* From Table 4.
The 97 total patients were randomly split into a training set and a test set. The numbers of patients for the training set investigated were 78, 65, 32, 25, and 19. The values are the proportion that the estimated p-values were less than or equal to 0.05 from a total of 10,000 computations, based on 10,000 randomly splits.