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The NCVS collects data from more than 94,800 persons in 62,200 households every 6 months and provides the nationâs only measures of the incidence of criminal victimization not reported to authorities. Since 2008, BJS has initiated a number of projects to assess and improve upon NCVS program methodology, including redesigning the sample plan, comparing alternative modes of interviewing, reducing non-response bias, examining various reference period...