PubmedMTK: PubMed Mining Toolkit

#' Medline citation counts by year of publication.
#'
#' A dataset containing Medline citation counts by year from 1947-2020.
#' 
#' @format A data frame with 75 rows and 3 variables:
#' @source \url{https://www.nlm.nih.gov/bsd/medline_cit_counts_yr_pub.html}
#' @usage data(pmtk_tbl_citations)
"pmtk_tbl_citations"

#' MeSH hierarchical vocabulary & thesaurus.
#'
#' A dataset containing the MeSH hierarchical vocabulary & thesaurus.
#' 
#' @format A data frame with 562300 rows and 10 variables:
#' @source \url{https://www.nlm.nih.gov/databases/download/mesh.html}
#' @usage data(pmtk_tbl_mesh)
"pmtk_tbl_mesh"

#' MeSH annotation frequencies.
#'
#' A dataset containing the frequency/relative frequency of MeSH annotations in PubMed abstracts included in the PubMedCentral - Open Access Common Use PMID list.
#' 
#' @format A data frame with 1304697 rows and 4 variables:
#' @source \url{https://github.com/jaytimm/PubmedMTK/blob/main/mds/pmc-reference.md}
#' @usage data(pmtk_tbl_pmc_ref)
"pmtk_tbl_pmc_ref"