derivesensspec: Calculate patient-level sensitivity and specificity.

In newrickey/mrmctools: Statistical Tools to Support Multi-Reader, Multi-Case (MRMC) Study Designs

Description

The sensitivity denominator will be the number of cases with at least one lesion. The specificity denominator will be the number of cases without any primary task lesions. For sensitivity, the calculation requires at least one reference lesion to be found with confidence greater than what has been specified in the function call. For specificity, it requires no false positive ROIs with confidence greater than the threshold. In addition to reader-modality-specific results, the GEE estimate of the common sensitivity by modality is returned.

Usage

derivesensspec(JAFROCfilename, sensitivitythreshold = 0,
  specificitythreshold = 0)

Arguments

JAFROCfilename	The is the excel file produced by the makeJAFROCfile function. This file is the source of most JAFROC analyses.
sensitivitythreshold	A numeric value representing the primary task confidence value that true positive localization need to be greater than to be considered a true detectioin.
specificitythreshold	A numeric value representing the primary task confidence value that a non-localization needs to be greater than to be counted as a false positive within a normal case.

Value

A dataframe with results

newrickey/mrmctools documentation built on May 28, 2019, 3:11 p.m.