Aggregate an Index

Create a one-column ledger (see LedgerDefinition) with rows identifying instances of an aggregation.

Usage

mp_aggregate(index, by = "Group", ledger_column = "group")

Arguments

index

An index to aggregate over.

by

A column set label to group by. By default a dummy and constant "Group" column is created.

ledger_column

Name of the column in the output ledger that describes the groups.

See also

Other functions that return ledgers mp_join()