SP500215 NIST Special Publication 500-215: The Second Text REtrieval Conference (TREC-2) Appendix B: System Features Appendix National Institute of Standards and Technology D. K. Harman [EM NAME [OCRerr] GE [1] J CLARIT [OCRerr] LSI [ IINC J_NYU [OCRerr] SYRACUSE [OCRerr] QUEE] *d List Yes No Yes, SMART Yes Yes Yes (Stage 2) Yes [OCRerr]r of Words 5 [2] 570 375 380 48 (Stage 2) 630 led Vocabulary No No No No No No ng None Yes Yes Yes Yes Yes lard Algorithms SMART Lovins No Kelly & Stone [13] Porter ihological analysis _______________ Yes [3] No Yes No Document eighting Ranking Gnly Yes [4] "ltc" [10] tf, idf Yes Yes [14] Yes Discovery No Yes Yes Yes Yes simplex noun NP's, VP's, Proper nouns & of phrase _______________ phrases [5] ______________ _________ Others complex nominals 2-word tical Methods No Yes Partially No Yes .ctic Methods Yes [6] _______________ __________ Yes Yes Ic parsing No Yes, see ahove No Yes Yes (partially) [15] No ense Disambiguation No Yes [7] No No Yes [16] No ic Associations No No No Yes Yes No Synonymy, Semantic relations Definition _________ specializations between concepts hecking Manual Correction) No No No No No No `,Correction No No No No No No Noun Identification No Yes [8] No Partial Yes No `2r No No No Yes Yes No .`h Patterns year numbers Dates Manually Indexed Terms No No N/A No No No rechniques to Build Data [OCRerr]res Yes [9] Yes [11] _________________ [17]