Likelihood Ratio Calculator
This calculator helps medical professionals determine the likelihood ratio in diagnostic testing, enhancing decision-making processes based on test results.
Calculator
Results
Positive Likelihood Ratio (LR+):
-
Negative Likelihood Ratio (LR-):
-
Data Source and Methodology
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The Formula Explained
LR+: \(\frac{\text{Sensitivity}}{1 - \text{Specificity}}\)
LR-: \(\frac{1 - \text{Sensitivity}}{\text{Specificity}}\)
Glossary of Terms
- Sensitivity: The probability that a test correctly identifies a condition.
- Specificity: The probability that a test correctly identifies the absence of a condition.
- LR+: The likelihood that a positive test result is correct.
- LR-: The likelihood that a negative test result is correct.
How It Works: A Step-by-Step Example
Given a test with 90% sensitivity and 85% specificity, the positive likelihood ratio (LR+) can be calculated as follows:
\(LR+ = \frac{90}{1 - 85} = 6\)
Frequently Asked Questions (FAQ)
What is a likelihood ratio?
A likelihood ratio is a value used to determine the accuracy of a diagnostic test.
Why are likelihood ratios important?
They help in understanding how much a test result will change the odds of having a disease.