expand_classification: Expand a hierarchical classification

In piar: Price Index Aggregation

Expand a hierarchical classification

Description

Expand a character representation of a hierarchical classification to make a price index aggregation structure. Expanded classifications be interacted together to get all combinations of aggregation structures.

Usage

expand_classification(x, width = 1L)

interact_classifications(..., sep = ":")

Arguments

x	A character vector, or something that can be coerced into one, of codes/labels for a specific level in a classification (e.g., 5-digit COICOP, 5-digit NAICS, 4-digit SIC).
width	An integer vector that gives the width of each digit in x. A single value is recycled to span the longest element in x. This cannot contain NAs. The default assumes each digit has a width of 1, as in the NAICS, NAPCS, and SIC classifications.
...	Lists of character vectors that give the codes/labels for each level of the classification, ordered so that moving down the list goes down the hierarchy (as made by expand_classification()).
sep	A character used to combine codes/labels across elements of .... The default uses ":".

Value

expand_classification() returns a list with a entry for each level in x giving the "digits" that represent each level in the hierarchy.

interact_classfications() returns a list of lists with the same structure as expand_classification().

See Also

aggregation_structure() to make a price-index aggregation structure.

split_classification() to expand a classification by splitting along a delimiter.

Examples

# A simple classification structure
#            1
#      |-----+-----|
#      11          12
#  |---+---|       |
#  111     112     121

expand_classification(c("111", "112", "121"))

# Expanding more complex classifications
# ... if last 'digit' is either TA or TS

expand_classification(
  c("111TA", "112TA", "121TS"),
  width = c(1, 1, 1, 2)
)

# ... if first 'digit' is either 11 or 12

expand_classification(c("111", "112", "121"), width = c(2, 1))

# ...if there are delimiters in the classification (like COICOP)

expand_classification(c("01.1.1", "01.1.2", "01.2.1"), width = 2)

piar documentation built on April 3, 2025, 7:38 p.m.