Free explainer2 min read
Likelihood ratios
Understand the model, recognise it in a stem, separate the look-alikes, then apply it.
Watch it explainedThe same test, in a screening clinic and in a referral clinic. Its predictive value changes. Its likelihood ratio does not.
01Memory anchor
LR+ = sens/(1−spec); LR− = (1−sens)/spec; an LR of 1 changes nothing.