IRS13 An Experiment in Automatic Thesaurus Construction chapter R. T. Dattola D. M. Murray Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. VIII-7 D D D D D D 1 2 3 4 5 6 Cl 1 o 0 0 0 0 C2 1 o 1 0 0 0 C3 1 o 1 0 0 0 C4 0 1 0 1 1 1 C5 0 1 0 1 0 1 C6 0 1 0 1 0 0 C7 0 o 1 0 0 0 C8 0 0 0 1 0 0 Cl C2 C3 C 4 Cs C6 C7 C 8 (a) Concept-Document Matrix C C C C C C C C8 1 2 3 4 5 6 7 1.0 .70 .70 0 0 0 0 0 .70 1.0 1.0 0 0 0 .70 0 .70 1.0 1.0 0 0 0 .70 0 0 0 0 1.0 .86 .70 0 .50 0 0 0 .86 1.0 .81 0 .57. 0 0 0 .70 .81 1.0 0 .70 0 .70 .70 0 0 0 1.0 0 0 0 0 .50 .57 .70 0 1.0 (b) Concept-Concept Similarity Matrix Cosine Correlation Construction of Concept - Concept. Similarity Matrix Fig. 1