DevChakraborty.com aka the JAFROC website

RJafroc replaces Windows JAFROC

An R package RJafroc is available at CRAN (comprehensive R archive network). RJafroc is an enhanced, free, open-source, cross-platform implementation of existing JAFROC Windows software, described in my book. Since it runs on any platform, including Windows, it makes sense to focus my efforts on RJafroc and discontinue updating the Windows version.

The R package reads data in all currently used data formats including Excel; it even outputs the results of significance testing in Excel format. Significance testing implements two methods in widespread use, a jackknife pseudo-value based method and an analysis of variance method with correlated errors based method. Included are tools for (1) calculating a number of free-response figures of merit; (2) sample size estimation for planning a future study ROC or FROC study; (3) viewing empirical operating characteristics in ROC and FROC paradigms; (4) producing report files; (5) saving a data file in appropriate format for analysis with alternate software; (6) comparing CAD to a group of radiologists interpreting the same cases; (7) fitting the radiological search model (RSM) and the contaminated binormal model (CBM) to ROC data; (8) fitting the correlated contaminated binormal model (CORCBM) to paired ROC data - this is the preferred replacement for CORROC software which is susceptible to degeneracy problems; (9) extracting measures of search and lesion-classification performances; and more.

Install R and RJafroc (for the R novice, but could be useful to others).

RJafroc User Manual.

Download RJafroc from CRAN or GitHub.

The second link is the most recent version, not yet on CRAN.



Creator: Dev P. Chakraborty, PhD