round_preserve_sum: Round preserving sum

In StatisticsNZ/er.helpers: Helper functions commonly used in Environmental Reporting at Stats NZ

Round preserving sum

Description

Round values preserving their sum. Often used to round percentages such that their totals still add to 100

Usage

round_preserve_sum(x, digits = 0)

Arguments

x	numeric vector to round
digits	integer indicating the number of decimal places to be used

Value

a numeric value

Examples

x <- c(10.3, 20.3, 69.4)
# These three values add to 100
sum(x)
# But when rounded they do not add to 100
sum(round(x))
# Using round_preserve_sum ensures the rounded values add to 100
round_preserve_sum(x)
sum(round_preserve_sum(x))

StatisticsNZ/er.helpers documentation built on Oct. 2, 2023, 7:24 a.m.