Date published:
Statistics:
Census 2021,
Census 2021 results,
Quality assurance
Download the Census 2021 statement about data quality.
Overview
This short paper outlines how the quality of Census 2021 data was assessed and assured, focusing on two key metrics:
- Overall response rate – how many people completed the census
- Item response rate – how often individual questions were answered
These insights support confident use of the data for research and decision-making.
Related document
The Census 2021 population and household estimates for Northern Ireland quality assurance report explains how NISRA ensured the accuracy, reliability, and integrity of the population and household estimates from Census 2021 in Northern Ireland. It details the rigorous checks and validation processes used to deliver trusted, high-quality statistics.