Groups for aggregation by various functions that take grouping options. Groups can be the name(s) of document variables (as a character vector), or variables whose length or number of rows (if a data.frame) equal the number of documents.
groups |
either: a character vector containing the names of document
variables to be used for grouping; or a factor or object that can be
coerced into a factor equal in length or rows to the number of documents.
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