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Table 5 Search tag frequencies

From: A Study on Pubmed Search Tag Usage Pattern: Association Rule Mining of a Full-day Pubmed Query Log

Query type Search field tag Number of queries with single tag Number of queries with two or more tags Total
Navigational [AUTHOR] 179,418 23,277 202,695
[PUBLICATION DATE] 2,197 51,021 53,218
[JOURNAL] 12,153 36,383 48,536
[PAGINATION] 330 36,213 36,543
[VOLUME] 89 33,630 33,719
[ISSUE] 4 10,608 10,612
[ENTREZ DATE] 695 3,490 4,185
[FIRST AUTHOR NAME] 1,000 2,478 3,478
[AFFILIATION] 1,197 1,341 2,538
[CORPORATE AUTHOR] 1,463 8 1,471
[PMID] 1,351 65 1,416
[GRANT NUMBER] 85 652 737
[MESH DATE] 21 201 222
[BOOK] 78 1 79
[FULL AUTHOR NAME] 64 30 79
[DATE] 13 53 66
[SECONDARY SOURCE ID] 34 0 34
[ARTICLE IDENTIFIER] 13 0 13
[NLMID] 6 0 6
Informational [MESH TERMS] 10,195 11,704 21,899
[LANGUAGE] 12,496 7,595 20,091
[TITLE] 7,180 3,765 10,945
[TITLE ABSTRACT] 5,001 4,889 9,890
[PUBLICATION TYPE] 605 7,366 7,971
[MESH MAJOR TOPIC] 2,047 5,847 7,894
[TEXT WORD] 1,227 5,950 7,177
[SUBSET] 2,775 4,167 6,942
[ALL FIELDS] 2,822 1,922 4,744
[FILTER] 466 1,564 2,030
[SUBHEADING] 117 1,552 1,669
[EC/RN NUMBER] 165 673 838
[SUBSTANCE] 263 459 722
[SOURCE] 200 44 244
[PHARMACOLOGICAL ACTION] 23 50 73
[PLACE OF PUBLICATION] 23 25 48
[PS] 19 4 23
[OTHER TERM] 3 6 9
  1. This table presents the total number of queries containing 37 different search field tags. This table also contains the number of queries containing single tag and two or more tags.