Fig. 19

Analysis of MeSH Keyword Associations and Qualifier Matrices in PubMed Publications. 19A: The distribution of the associations between subjects and objects in semantic relations derived from MeSH keywords in PubMed publications. The majority of these associations are concentrated in a limited number of publications. A small fraction (42.7%) of associations are present in 100 or more publications (indicated by the green dot). 19B: The probability of successful creation of qualifier matrices increases with the number of PubMed publications containing the MeSH association, reaching a plateau near 1 at around twenty publications. However, for associations available in 100 or more publications, the generation rate of these matrices remains below the plateau at 73.3% (indicated by the red dots)