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NCVS field staff experienced two major interventions in 2012: completion of a refresher training and performance monitoring program which began the previous year, and a field realignment effort which reduced the number of Census Bureau Regional Offices from twelve to six. To assess the impact of these interventions, we fit Bayesian longitudinal models describing key quality indicators and survey outcomes over a five-year period (2008--2012). After accounting for long-term trends, annual periodic cycles, characteristics of the interviewers' monthly assignments, and random interviewer variation, we detected some statistically significant effects of the interventions on the following variables.
Response rates: Refresher training and performance monitoring were associated with a modest but significant decrease in household response rates in 2011 but not in 2012.
Screener times: Refresher training and performance monitoring produced large and significant increases in the average duration of the screener interview in 2011 and 2012.
Personal crime and household property crime: Neither the refresher training and performance monitoring program nor field realignment were associated with any significant changes in the collection of crimes in 2012.
Because no significant effects on the collection of crimes were detected, there is no evidence to suggest that victimization rates for 2012 or comparisons between 2012 and previous years were impacted.
Joseph L. Schafer. (2014). Modeling the Effects of Recent Field Interventions in the National Crime Victimization Survey. Center for Statistical Research & Methodology Research Report Series (Statistics #2014-02). U.S. Census Bureau. Available online at <http://www.census.gov/srd/papers/pdf/rrs2014-02.pdf>.
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