metrics | R Documentation |
Estimated performance metrics from ROC curves.
binary_sens(truth, rating) binary_spec(truth, rating) binormal_auc( truth, rating, partial = FALSE, min = 0, max = 1, normalize = FALSE ) binormal_eu(truth, rating, slope = 1) binormal_sens(truth, rating, spec) binormal_spec(truth, rating, sens) binormalLR_auc( truth, rating, partial = FALSE, min = 0, max = 1, normalize = FALSE ) binormalLR_eu(truth, rating, slope = 1) binormalLR_sens(truth, rating, spec) binormalLR_spec(truth, rating, sens) empirical_auc( truth, rating, partial = FALSE, min = 0, max = 1, normalize = FALSE ) empirical_eu(truth, rating, slope = 1) empirical_sens(truth, rating, spec) empirical_spec(truth, rating, sens) trapezoidal_auc( truth, rating, partial = FALSE, min = 0, max = 1, normalize = FALSE ) trapezoidal_sens(truth, rating, spec) trapezoidal_spec(truth, rating, sens)
truth |
vector of true binary statuses. |
rating |
vector of 0-1 binary ratings for the binary metrics and ranges of numeric ratings for the others. |
partial |
character string |
min, max |
minimum and maximum sensitivity or specificity values over which to calculate partial AUC. |
normalize |
logical indicating whether partial AUC is divided by the
interval width ( |
slope |
slope of the iso-utility line at which to compute expected utility of the ROC curve. |
sens, spec |
numeric sensitivity/specificity at which to calculate specificity/sensitivity. |
Performance metrics measure the degree to which higher case ratings are
associated with positive case statuses, where positive status is taken to be
the highest level of truth
. Available metrics include area under the
ROC curve (auc), expected utility of the ROC curve (eu) at a given
iso-utility line (Abbey, 2013), sensitivity (sens) at a given specificity,
and specificity (spec) at a given sensitivity.
Returns a numeric value.
Abbey CK, Samuelson FW and Gallas BD (2013). Statistical power considerations for a utility endpoint in observer performance studies. Academic Radiology, 20: 798-806.
mrmc
, srmc
, stmc
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