There are several classes to represent price indexes.
All indexes inherit from the
piar_indexvirtual class.Period-over-period indexes that can be chained over time inherit from
chainable_piar_index.Fixed-base indexes inherit from
direct_piar_index.
Details
The piar_index object is a list-S3 class with the following
components:
- index
A matrix of index values with a column for each period in
timeand a row for each level inlevels.- contrib
A list-matrix containing named vectors that give the percent-change contributions for each price relative with a column for each time period in
timeand a row for each level inlevels, orNULL.- levels
A character vector giving the levels of the index.
- time
A character vector giving the time periods for the index.
The chainable_piar_index and direct_piar_index subclasses have
the same structure as the piar_index class, but differ in the methods
used to manipulate the indexes.