round3: Randomly round a dataset to base 3.

In StatisticsNZ/dembase: Analysing Cross-Classified Data about Populations

Description

Confidentialise counts data by randomly rounding it to multiples of three.

Usage

round3(object)

## S4 method for signature 'Counts'
round3(object)

## S4 method for signature 'Values'
round3(object)

## S4 method for signature 'array'
round3(object)

## S4 method for signature 'numeric'
round3(object)

Arguments

object

An object of class DemographicArray, an ordinary array, or a numeric vector.

Details

Randomly rounding to base three is a popular confidentialisation technique at statistical agencies. It only works with data consisting entirely of integers, though negative integers are allows.

A value is rounded as follows:

• If the value is divisible by 3, leave it unchanged.

• If there is a remainder of 1 after dividing by 3, round down (ie subtract 1) with probability 2/3, and round up (ie add 2) with probability 1/3.

• If there is a remainder of 2 after dividing by 3, round down (ie subtract 2) with probability 1/3, and round up (ie add 1) with probability 2/3.

Missing values are permitted, and are left unchanged.

Value

An object with the same class as object.

Examples

x <- CountsOne(0:10, labels = letters[1:11], name = "region")
round3(x)
round3(x)

StatisticsNZ/dembase documentation built on Dec. 25, 2021, 4:49 p.m.