As indicated in Section 5, suppression of data occurs when certain census questions are not asked of all respondents. Additionally, suppression of data may be applied for product-specific reasons due, typically, to the size of the product and/or the constraints of the media on which the product is being disseminated.

Incidence reporting

Incidence reporting is a process used to order or rank characteristic data by size within products. It can be used as a method to select only the 'n' highest categories of a characteristic for inclusion in a product.

Zero suppress

Zero suppress refers to the removal of records in which all of the counts are equal to zero. This method is used to reduce the size of an output product by removing any rows of the output matrix where all data are equal to zero.

Place of work flow suppression

Flow suppression is a process used to remove records with very low counts from place of work flow tables. It can be used as a method to select only those commuting flows with a count greater than a threshold value for inclusion in a product. The default value is 20. These are typically product-specific requirements and therefore are not part of the automated suppression systems.

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