How this calculation works
Translate two conditional test rates into likelihood ratios for positive and negative outcomes.
LR+ = sensitivity/(1−specificity), LR− = (1−sensitivity)/specificityA worked example
Sensitivity 0.8 and specificity 0.9 yield LR+ 8 and LR− about 0.222.
Good to know
These ratios describe test evidence. They do not specify an individual’s baseline odds.
Reference: OpenStax Introductory Statistics (opens in a new tab) ↗
Read the result
Translate two conditional test rates into likelihood ratios for positive and negative outcomes.
The primary result is labeled “Positive likelihood ratio”. Keep the input definitions in view when comparing this result with another method.
Try a related calculation
These ratios describe test evidence. They do not specify an individual’s baseline odds.
For a related exercise, try the statistics calculator.
A few questions, answered
How can I check the default inputs by hand?
Sensitivity 0.8 and specificity 0.9 yield LR+ 8 and LR− about 0.222.
Which rule does this calculator apply?
LR+ = sensitivity/(1−specificity), LR− = (1−sensitivity)/specificity