document-term clustering: proximity of subjects correspond with psychology of marriage in biomedicine literature during the years “1990-99” and “2000-2008”

introduction: the study on psychology of marriage rooted in the social issues. the field has also found its way to biomedicine. the current research, based on the document-term clustering methods, focus on term-proximity of documents that were related to the field of psychology of marriage in biomedicine literature. methods: the co-occurrence frequency of terms within the two different corpuses of documents resulted in two proximity matrixes. the corpuses contained sequentially the documents published during the years “1990-99” and 2000-2008”. those documents were returned by two separate searches in medline. the cosine method was established to determine the proximity of terms. besides, the terms were clustered by the ward’s method. results: the measurement of term-proximity resulted in two graphs of hierarchical clusters. the comparison revealed that twenty terms up to thirty-eight kept permanently their proximity with one or more other terms during the two periods of study adult and 21(60%) prenatal had a correct sequence. conclusion: dividing correspond subjects with psychology of marriage into five areas prepares the opportunity to compare the two hierarchical graphs and find the relationship between and within those areas. consequently, document-term clustering assists to answer some reference queries.