Table 2.
A Long–Risk-Set Data Structure for a Hypothetical Case-Cohort Study With 2 Casesa
| SETNO | Variable | ||
|---|---|---|---|
| ID | Y | Z | |
| 1 | 10 | 1 | 1.6 |
| 1 | 8 | 0 | 0.0 |
| 1 | 4 | 0 | 0.0 |
| 1 | 3 | 0 | 1.1 |
| 1 | 5 | 0 | 1.3 |
| 1 | 2 | 0 | 1.0 |
| 1 | 1 | 0 | 0.8 |
| 1 | 7 | 0 | 0.0 |
| 1 | 6 | 0 | 0.0 |
| 2 | 9 | 1 | 0.0 |
| 2 | 5 | 0 | 1.3 |
| 2 | 2 | 0 | 1.0 |
| 2 | 1 | 0 | 0.8 |
| 2 | 7 | 0 | 0.0 |
| 2 | 6 | 0 | 0.0 |
Abbreviations: ID, identifier; SETNO, set number.
a “SETNO” indexes the risk set formed at each failure time; “ID” is a unique identifier for each study participant; Y is the binary outcome variable; and Z is an explanatory variable of interest.