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Practical Statistics with Dr Simone

Anaesthesia Coffee Break

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The Probability Ratio of a Negative Test

Likelihood ratios can be any number from naught to infinity. They argue, if they're above one, they argue for the diagnosis of interest. A positive test greater than one is telling you, yup, this test is fairly reliable. It's telling you that this patient has the disease. The larger the number above one, the more you can rely on that test,. That's what those equations mean. If you've got a likelihood ratio of one, it's just my chance. The test has no value whatsoever.

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