Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Search filter performance measures
| Search results | Relevant citations | Irrelevant citations |
|---|---|---|
| Citations retrieved by search | a | b |
| Citations not retrieved by search | c | d |
| Formulae | ||
|
Sensitivity (recall) = a/(a + c) Specificity = d/(b + d) Precision = a/(a + b) Accuracy = (a + d)/(a + b + c + d) Number Needed to Read = 1/Precision | ||
