| http://www.w3.org/ns/prov#value | - Most prevalent of these is that the survey is principally a tool for re-weighting the SPPI, so the industry breakdowns are to an extent restricted to matching what is required for the SPPI. Also, all those businesses providing data to the SPPI (approximately 3,000) were automatically included in the STS sample, whereas normally a unique random sample would be created for such a survey.
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