IRS13 Correlation Measures chapter K. Reitsma J. Sagalyn Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. The 82 Document ADI Collection Averages Over 35 Requests, Abstracts Thesaurus-i Overlap Cosine P-R-N R-S 1 rnmalized Recall .7781 .8006 .7974 .5355 rmalized Precision 5651 .6086 .6073 .2666 OVERLAP COSINE P-R-N R-S 1 cALL PREC S.D. PREC S.D.D. PREC S.D.D. PREC S.D.D. Os .484[OCRerr] .3761 .6400 .3404 .6435 .4229 .1288 .3880 10 .4841 .3756 .6399 .3406 .6355 .4242 .1308 .3889 15 .486s .3768 .6260 .3479 .6286 .4295 .1231 .3795 20 .4843 .3756 .6097 .3524 .6i88 .4396 .1190 .3738 25 .4726 .3685 .5840 .3437 .6039 .4354 .1170 .3626 30 .4573 .3595 .5527 .3221 .5843 .4093 .1119 .3549 35 .44oo .3534 .5214 .3092 .5549 .3830 .1070 .3497 !+o .4142 .3410 .4915 .2917 .5118 .3398 .1041 .3435 I+[OCRerr] .3953 .3343 .4663 .2758 .4761 .3084 .0967 .3386 50 .3870 .3329 .4448 .2687 .4452 .2935 .0913 .3325 55 .3743 .3195 .4279 .2546 .4208 .2649 .o944 .3166 [OCRerr] .3556 .3066 .4097 .2449 .3929 .2438 .0949 .3032 [OCRerr]5 .3380 .2986 .3898 .2417 .3669 .2307 .0957 .2929 (0 .3192 .2862 .3617 .2330 .3417 .2208 .0944 .2792 75 .3018 .2736 .3319 .2309 .3159 .2173 .0916 .2625 30 .2805 .2547 .3103 .2038 .2934 .1861 .0893 .2412 35 .2593 .2385 .2867 .1742 .2716 .1581 .0876 .2244 [OCRerr] .2358 .2223 .2616 .1487 .2482 .1350 .0857 .2091 )5 .2104 .2027 .2340 .1310 .2223 .1210 .o846 .1900 )0 .1857 .1883 .2070 .1244 .1969 .1195 .0832 .1750 Recall-Precision Table (ADI Collection) Table 1