dx_lrt_neg | R Documentation |
Calculates the Negative Likelihood Ratio (LR-) from a confusion matrix object. LR- compares the probability of a negative test result among patients with the disease to the probability of a negative test result among patients without the disease.
dx_lrt_neg(cm, detail = "full", ...)
cm |
A dx_cm object created by |
detail |
Character specifying the level of detail in the output: "simple" for raw estimate, "full" for detailed estimate including 95% confidence intervals. |
... |
Additional arguments to pass to metric_binomial function, such as
|
The negative likelihood ratio is calculated as (FN / (TP + FN)) / (TN / (FP + TN)). It is used to assess the diagnostic usefulness of a test. A LR- closer to 0 indicates a good diagnostic test that can confidently rule out the disease when the test is negative.
Depending on the detail
parameter, returns a numeric value
representing the calculated metric or a data frame/tibble with
detailed diagnostics including confidence intervals and possibly other
metrics relevant to understanding the metric.
cm <- dx_cm(dx_heart_failure$predicted, dx_heart_failure$truth,
threshold =
0.5, poslabel = 1
)
simple_lrn <- dx_lrt_neg(cm, detail = "simple")
detailed_lrn <- dx_lrt_neg(cm)
print(simple_lrn)
print(detailed_lrn)
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