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Because some responses are assigned nfd or nec codes rather than the codes of particular Religious Groups, it is important that in validating input codes at editing stage, manipulating data, and deriving output items, the full range of valid codes are included in all specifications. The full range of valid codes can be obtained from Chapter 2. Classification structure, and Appendix 1. Supplementary codes.
Regardless of the level of aggregation envisaged for the dissemination of data, wherever possible, data should be captured, classified and stored at the base level of the classification. Collecting and storing data at the most detailed level of the classification allows the greatest flexibility for the output of data, enables more detailed and complex analyses, facilitates comparisons with previous data using different classifications, and preserves information that may prove historically useful.