TABLE 1.
Search filter categories 3
| 1st generation: non‐validated | Designed subjectively and not tested for effectiveness against an independent set of relevant records (validation) |
| 2nd generation: validated (subjective methods) | Developed as 1st generation, but effectiveness is tested against an independent set of relevant records (known as a “gold standard”), resulting in a validated filter |
| 3rd generation: validated (objective methods) | Designed more objectively through various established methods, such as frequency analysis and logistic regression. The designed filter is then validated as in 2nd generation filters |