Subject indexing and citation indexing—part I: Clustering structure in the cystic fibrosis document collection∗

摘要

The presence of clustering structure in the cystic fibrosis Document Collection is evaluated as a function of the exhaustivity of four subject representations and two citation representations. Experimental results show that for each representation the evidence for clustering structure diminishes as the exhaustivity of the representation decreases. Three of the four subject representations show no evidence of clustering structure at the least exhaustive representations. Although many documents have no references or citations, the citation representations demonstrate the presence of clustering structure over a wider range of exhaustivity levels than the subject representations. Both citation indexes show evidence of clustering structure at the least exhaustive representations. The structures imposed on the CF Document Collection by the subject and citation indexes satisfy the necessary condition for a meaningful clustering outcome.