noumbissi: Noumbissi's Digit Heaping Index

In heaping: Correction of Heaping on Individual Level

Noumbissi's Digit Heaping Index

Description

Noumbissi's method improves on Whipple's method by extending its basic principle to all ten digits. It compares the count of ages ending in a specific digit to the count in 5-year age groups centered on that digit.

Usage

noumbissi(
  x,
  digit = 0,
  ageMin = 20 + digit,
  ageMax = ageMin + 30,
  weight = NULL
)

Arguments

x	numeric vector of individual ages.
digit	integer (0-9) specifying which terminal digit to evaluate (default 0).
ageMin	minimum age to include (default 20 + digit).
ageMax	maximum age to include (default ageMin + 30).
weight	optional numeric vector of sampling weights.

Details

Calculate Noumbissi's index for a specific terminal digit.

The index compares the number of persons reporting ages ending in a specific digit to one-fifth of the population in the 5-year age groups centered on those ages.

Interpretation:

• 1.0: no preference for the digit

• >1.0: preference (attraction) to the digit

• <1.0: avoidance of the digit

Value

A single numeric value representing Noumbissi's index for the specified digit.

Author(s)

Matthias Templ

References

Noumbissi, A. (1992). L'indice de Whipple modifie: une application aux donnees du Cameroun, de la Suede et de la Belgique. Population, 47(4), 1038-1041.

See Also

spoorenberg for Total Modified Whipple index, whipple for original Whipple's index.

Other heaping indices: bachi(), coale_li(), heaping_indices(), jdanov(), kannisto(), myers(), spoorenberg(), whipple()

Examples

# No heaping
set.seed(42)
age_uniform <- sample(20:70, 10000, replace = TRUE)
noumbissi(age_uniform, digit = 0)  # Should be close to 1
noumbissi(age_uniform, digit = 5)  # Should be close to 1

# Heaping on digit 0
age_heap0 <- sample(seq(20, 70, by = 10), 5000, replace = TRUE)
noumbissi(age_heap0, digit = 0)  # Should be > 1

heaping documentation built on Feb. 10, 2026, 1:08 a.m.