Code of Practice for Statistics

Q1: Suitable data sources

Statistics should be based on the most appropriate data to meet intended uses. The impact of any data limitations for use should be assessed, minimised and explained.


Q1.1 Statistics should be based on data sources that are appropriate for the intended uses. The data sources should be based on definitions and concepts that are suitable approximations of what the statistics aim to measure, or that can be processed to become suitable for producing the statistics.

Q1.2 Statistics producers should establish and maintain constructive relationships with those involved in the collection, recording, supply, linking and quality assurance of data, wherever possible.

Q1.3 A clear statement of data requirements should be shared with the organisations that provide that data, setting out decisions on timing, definitions and format of data supply, and explaining how and why the data will be used.

Q1.4 Source data should be coherent across different levels of aggregation, consistent over time, and comparable between geographical areas, whenever possible.

Q1.5 The nature of data sources used, and how and why they were selected, should be explained. Potential bias, uncertainty and possible distortive effects in the source data should be identified and the extent of any impact on the statistics should be clearly reported.

Q1.6 The causes of limitations in data sources should be identified and addressed where possible. Statistics producers should be open about the extent to which limitations can be overcome and the impact on the statistics.

Q1.7 The impact of changes in the circumstances and context of a data source on the statistics over time should be evaluated. Reasons for any lack of consistency and related implications for use should be clearly explained to users.

The Scottish Crime and Justice Survey (SCJS) is an annual, large-scale, continuous survey carried out by the Scottish Government that measures adults’ experiences and perceptions of crime in Scotland.

The Scottish Government appointed a consortium of two contractors to jointly deliver the SCJS from 2016/17 under a single contract. Fieldwork is shared jointly across both organisations, while Ipsos Mori focuses on the content and questionnaire development, and ScotCen is responsible for data processing, from data cleaning through to delivery of final data sets.

The Scottish Government maintains a close and effective working relationship with the contractor consortium to manage and deliver the survey:

  • It established appropriate safeguards by specifying the roles, data requirements, delivery arrangements and communication channels between the survey team in Scottish Government and the contractor consortium
  • When setting up the contract, the statistical team modernised the data coding and processing arrangements for the ‘offence codes’ used to classify incidents, to ensure a smooth transition to the new contractors

The Scottish Government carried out a range of activities to decide on the survey design, including meeting with users and potential contractors. It also produces a detailed technical guide with information about the survey design and delivery, including the sample design and selection and the survey response.

This approach gives the Scottish Government and users of the statistics confidence in the suitability and quality of the data sources and data collection process.

Description Link Source
Guidance on quality assuring administrative data used to create statistics. It includes explanatory notes, case examples, FAQs, the actual toolkit (audit questionnaire), and questions to prompt thinking when conducting the audit. Quality Assurance of Administrative Data (QAAD) UKSA
Guidance on quality assuring management information (MI) – aggregate information collated during the normal course of business to inform operational delivery, policy development or the management of performance. It includes examples of the practices to use. Quality Assurance of Management Information (QAMI) UKSA
Another way to access the QAAD and QAMI guidance. Administrative data and official statistics (QAAD and QAMI) UKSA
Guidelines that aid producers in the production of official statistics. They include information about measuring and reporting statistical quality, quality assurance, and reporting metadata. GSS Quality Guidelines GSS


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