Ncontributors

Assuming aggregates are calculated via a dummy matrix by
<code>z = t(x) %*% y</code>, the the number of unique contributing groups,
according to a grouping variable, are found for each aggregate.
The missing group category is not counted.

A statistical disclosure control tool to protect tables by suppression
using the Gaussian elimination secondary suppression algorithm
(Langsrud, 2024) <doi:10.1007/978-3-031-69651-0_6>. A suggestion is
to start by working with functions SuppressSmallCounts() and
SuppressDominantCells(). These functions use primary suppression functions for
the minimum frequency rule and the dominance rule, respectively. Novel
functionality for suppression of disclosive cells is also included. General
primary suppression functions can be supplied as input to the general working
horse function, GaussSuppressionFromData(). Suppressed frequencies can be
replaced by synthetic decimal numbers as described in
Langsrud (2019) <doi:10.1007/s11222-018-9848-9>.

Oyvind Langsrud

GaussSuppression

Tabular Data Suppression using Gaussian Elimination

Øyvind Langsrud

Daniel Lupp

Hege Bøvelstad

Vidar Norstein Klungre

Statistics Norway 

Ncontributors function

<dl><dt>x</dt>
<dd>A (sparse) dummy matrix</dd>
<dt>groups</dt>
<dd>Vector of group categories</dd></dl>

Arguments

Author

Find the number of unique groups contributing to aggregates — Ncontributors

<dl>

<dt>x</dt>
<dd>A (sparse) dummy matrix</dd>


<dt>groups</dt>
<dd>Vector of group categories</dd>

</dl>

Ncontributors: Find the number of unique groups contributing to aggregates

Description

Usage

Value

Arguments

Author

See Also

Examples