Creates a vector of integer study identifiers corresponding to the rows of a CompadreDB object, based on unique combinations of the columns 'Authors', 'Journal', 'YearPublication', and 'DOI.ISBN' (or optionally, a different set of columns supplied by the user).
cdb_id_studies(cdb, columns = c("Authors", "Journal", "YearPublication", "DOI.ISBN"))
A CompadreDB object
Vector of column names from which unique combinations should
be identified. Defaults to
Vector of integer study identifiers corresponding to the rows of
cdb, based on unique combinations of the elements in
Identifiers are assigned by pasting together the relevant columns, assigning factor levels based on alphabetical order, and then converting the factor levels to integers.
Compadre$StudyID <- cdb_id_studies(Compadre)