Calculates the empirical cross-entropy for likelihood ratios from a sequence same and different item comparisons
array of likelihood ratios for same source item comparisons
array of likelihood ratios for different source item comparisons
array of ordinates for the prior in ascending order, and between 0 and 1. Default is 99 divisions of 0.01 to 0.99
Returns an S4 object of class
The function to calculate the values of the likelihood ratio for the
calibrated.set draws heavily upon the
opt_loglr.m function from Niko Brummer's FoCal package for Matlab.
The empirical cross-entropy for a set of comparisons for items of known origin can be used as a measure of performance of the comparisons. This function takes the likelihood ratios.
Ramos, D. & Gonzalez-Rodriguez, J. (2008) Cross-entropy analysis of the information in forensic speaker recognition; IEEE Odyssey.
Zadora, G. & Ramos, D. (2010) Evaluation of glass samples for forensic purposes - an application of likelihood ratio model and information-theoretical approach. Chemometrics and Intelligent Laboratory: 102; 63-83.
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