The holy LR is a vast step forwars in understanding tests- BUT when
combining sens and spec into ONE measure- we lose information. E.g. at
times having a test with high specificity is very important, whereas at
other times high sensitivity is the thing you want.
Also, and quite disheartening:
A sens 40% and spec 98% => LR+ =20 and
B sens 80% and spec 96% => LR+ =20 and
C sens 100% and spec 95% => LR+ = 20
A, B and C should generate very different test interpretations
Atle
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