BJS: Bureau of Justice Statistics

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Bureau of Justice Statistics (BJS)
Home  | Data Collection Detail

Data Collection: National Crime Victimization Survey (NCVS)
Status: Active
Frequency: Ongoing from 1973
Latest data available: 2014

NCVS is the nation's primary source of information on criminal victimization. Each year, data are obtained from a nationally representative sample of about 90,000 households, comprising nearly 160,000 persons, on the frequency, characteristics, and consequences of criminal victimization in the United States. Each household is interviewed twice during the year. The survey enables BJS to estimate the likelihood of victimization by rape or sexual assault, robbery, aggravated and simple assault, theft, household burglary, and motor vehicle theft for the population as a whole as well as for segments of the population such as women, the elderly, members of various racial or ethnic groups, city dwellers, and other groups. The NCVS provides the largest national forum for victims to describe the impact of crime and characteristics of violent offenders.

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Collection Period

1973-2014

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Questionnaires

Identity Theft Supplement (ITS) to the National Crime Victimization Survey
2012 PDF (276K) | 2008 PDF (169K)
NCVS Basic Screen Questionnaire
2012-2014 PDF (232K) | 2009-2011 PDF (264K) | 2008 PDF (296K) | 2007 PDF (335K) | 2004 PDF (187K) | 2001 PDF
NCVS Control Card
2012-2014 PDF
NCVS Crime Incident Report
2012-2014 PDF (157K) | 2009-2011 PDF (726K) | 2008 PDF (648K) | 2007 PDF (335K) | 2004 PDF (169K) | 2001 PDF
NCVS for Spanish-speaking respondents
2001 Basic Screen Questionnaire for Spanish (221K) | 2001 Crime Incident Report (196K)
School Crime Supplement (SCS)
2013 PDF (213K) | 2011 PDF (123K) | 2009 PDF (194K) | 2001 PDF | 1999 PDF
Supplemental Victimization Survey (SVS)
2006 PDF (163K)
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Documentation

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Methodology

Survey coverage

The National Crime Victimization Survey (NCVS) is an annual data collection conducted by the U.S. Census Bureau for the Bureau of Justice Statistics (BJS). The NCVS is a self-report survey in which interviewed persons are asked about the number and characteristics of victimizations experienced during the prior 6 months. The NCVS collects information on nonfatal personal crimes (rape or sexual assault, robbery, aggravated and simple assault, and personal larceny) and household property crimes (burglary, motor vehicle theft, and other theft) both reported and not reported to police. In addition to providing annual level and change estimates on criminal victimization, the NCVS is the primary source of information on the nature of criminal victimization incidents.

Survey respondents provide information about themselves (e.g., age, sex, race and Hispanic origin, marital status, education level, and income) and whether they experienced a victimization. The NCVS collects information for each victimization incident about the offender (e.g., age, race and Hispanic origin, sex, and victim–offender relationship), characteristics of the crime (including time and place of occurrence, use of weapons, nature of injury, and economic consequences), whether the crime was reported to police, reasons the crime was or was not reported, and victim experiences with the criminal justice system.

The NCVS is administered to persons age 12 or older from a nationally representative sample of households in the United States. The NCVS defines a household as a group of persons who all reside at a sampled address. Persons are considered household members when the sampled address is their usual place of residence at the time of the interview and when they have no usual place of residence elsewhere. Once selected, households remain in the sample for 3 years, and eligible persons in these households are interviewed every 6 months either in person or over the phone for a total of seven interviews.

All first interviews are conducted in person with subsequent interviews conducted either in person or by phone. New households rotate into the sample on an ongoing basis to replace outgoing households that have been in the sample for the 3-year period. The sample includes persons living in group quarters, such as dormitories, rooming houses, and religious group dwellings, and excludes persons living in military barracks and institutional settings such as correctional or hospital facilities, and persons who are homeless.

Nonresponse and weighting adjustments

In 2014, 90,380 households and 158,090 persons age 12 or older were interviewed for the NCVS. Each household was interviewed twice during the year. The response rate was 84% for households and 87% for eligible persons. Victimizations that occurred outside of the United States were excluded from this report. In 2014, less than 1% of the unweighted victimizations occurred outside of the United States and were excluded from the analyses.

Estimates in NCVS reports generally use data from the 1993 to 2014 NCVS data files, weighted to produce annual estimates of victimization for persons age 12 or older living in U.S. households. Because the NCVS relies on a sample rather than a census of the entire U.S. population, weights are designed to inflate sample point estimates to known population totals and to compensate for survey nonresponse and other aspects of the sample design.

The NCVS data files include both person and household weights. Person weights provide an estimate of the population represented by each person in the sample. Household weights provide an estimate of the U.S. household population represented by each household in the sample. After proper adjustment, both household and person weights are also typically used to form the denominator in calculations of crime rates.

Victimization weights used in this analysis account for the number of persons present during an incident and for high-frequency repeat victimizations (i.e., series victimizations). Series victimizations are similar in type but occur with such frequency that a victim is unable to recall each individual event or describe each event in detail. Survey procedures allow NCVS interviewers to identify and classify these similar victimizations as series victimizations and to collect detailed information on only the most recent incident in the series.

The weight counts series incidents as the actual number of incidents reported by the victim, up to a maximum of 10 incidents. Including series victimizations in national rates results in large increases in the level of violent victimization; however, trends in violent crime are generally similar, regardless of whether series victimizations are included. In 2014, series incidents accounted for about 1% of all victimizations and 4% of all violent victimizations. Weighting series incidents as the number of incidents up to a maximum of 10 incidents produces more reliable estimates of crime levels, while the cap at 10 minimizes the effect of extreme outliers on rates. Additional information on the series enumeration is detailed in the report Methods for Counting High-Frequency Repeat Victimizations in the National Crime Victimization Survey (NCJ 237308, BJS web, April 2012).

Standard error computations

When national estimates are derived from a sample, as with the NCVS, caution must be used when comparing one estimate to another estimate or when comparing estimates over time. Although one estimate may be larger than another, estimates based on a sample have some degree of sampling error. The sampling error of an estimate depends on several factors, including the amount of variation in the responses and the size of the sample. When the sampling error around an estimate is taken into account, the estimates that appear different may not be statistically different.

One measure of the sampling error associated with an estimate is the standard error. The standard error can vary from one estimate to the next. Generally, an estimate with a small standard error provides a more reliable approximation of the true value than an estimate with a large standard error. Estimates with relatively large standard errors are associated with less precision and reliability and should be interpreted with caution.

To generate standard errors around numbers and estimates from the NCVS, the Census Bureau produced generalized variance function (GVF) parameters for BJS. The GVFs take into account aspects of the NCVS complex sample design and represent the curve fitted to a selection of individual standard errors based on the Jackknife Repeated Replication technique. The GVF parameters were used to generate standard errors for each point estimate (e.g., counts, percentages, and rates) in this report.

BJS conducted tests to determine whether differences in estimated numbers, percentages, and rates in this report were statistically significant once sampling error was taken into account. Using statistical programs developed specifically for the NCVS, all comparisons in the text were tested for significance. The primary test procedure was the Student’s t-statistic, which tests the difference between two sample estimates. Differences described as higher, lower, or different passed a test at the 0.05 level of statistical significance (95% confidence level). Differences described as somewhat, slightly, or marginally different, or with some indication of difference, passed a test at the 0.10 level of statistical significance (90% confidence level). Caution is required when comparing estimates not explicitly discussed in this report.

Data users can use the estimates and the standard errors of the estimates provided in this report to generate a confidence interval around the estimate as a measure of the margin of error. The following example illustrates how standard errors can be used to generate confidence intervals:

According to the NCVS, in 2014, the violent victimization rate among persons age 12 or older was 20.1 per 1,000 persons (see table 1 in Criminal Victimization, 2014, NCJ 248973, August 2015). Using the GVFs, it was determined that the estimated victimization rate has a standard error of 1.2 (see appendix table 2  in Criminal Victimization, 2014, NCJ 248973, August 2015). A confidence interval around the estimate was generated by multiplying the standard errors by ±1.96 (the t-score of a normal, two-tailed distribution that excludes 2.5% at either end of the distribution). Therefore, the 95% confidence interval around the 20.1 estimate from 2014 is 20.1 ± (1.2 X 1.96) or (17.7 to 22.5). In others words, if different samples using the same procedures were taken from the U.S. population in 2014, 95% of the time the violent victimization rate would fall between 17.7 and 22.5 per 1,000 persons.

In this report, BJS also calculated a coefficient of variation (CV) for all estimates, representing the ratio of the standard error to the estimate. CVs provide a measure of reliability and a means for comparing the precision of estimates across measures with differing levels or metrics.

Methodological changes to the NCVS in 2006

Methodological changes implemented in 2006 may have affected the crime estimates for that year to such an extent that they are not comparable to estimates from other years. Evaluation of 2007 and later data from the NCVS conducted by BJS and the Census Bureau found a high degree of confidence that estimates for 2007, 2008, 2009, 2010, 2011, 2012, 2013, and 2014 are consistent with and comparable to estimates for 2005 and previous years. The reports, Criminal Victimization, 2006, NCJ 219413, December 2007; Criminal Victimization, 2007, NCJ 224390, December 2008; Criminal Victimization, 2008, NCJ 227777, September 2009; Criminal Victimization, 2009, NCJ 231327, October 2010; Criminal Victimization, 2010, NCJ 235508, September 2011; Criminal Victimization, 2011, NCJ 239437, October 2012, Criminal Victimization, 2012, NCJ 243389, October 2013; and Criminal Victimization, 2014, NCJ 248973, August 2015 are available on the BJS website.

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Publications & Products

The following publications and products were generated by BJS using data from this collection.

Criminal Victimization, 2014 Presents 2014 estimates of rates and levels of criminal victimization in the United States.
  Press Release | PDF (745KB) | ASCII file (42KB) | Comma Separated Values (CSV) (Zip format)
Part of the Criminal Victimization Series

Indicators of School Crime and Safety: 2014 Presents data on crime and safety at school from the perspectives of students, teachers, and principals.
  Summary (PDF 172K) | Full Report (PDF 3.2M) | Tables (available at NCES) (Other)
Part of the Indicators of School Crime and Safety Series

Crime Against Persons with Disabilities, 2009–2013 - Statistical Tables Presents estimates of nonfatal violent victimization (rape, sexual assault, robbery, and aggravated and simple assault) against persons age 12 or older with disabilities from 2009 to 2013.
  Press Release | Summary (PDF 247K) | Full report (PDF 532K) | ASCII file (37K) | Comma-delimited format (.csv) (Zip format 32K)
Part of the Crime Against People with Disabilities Series

Crime Against Persons with Disabilities, 2009-2013 - Statistical Tables VIOLENT CRIME RATE IN 2013 AGAINST PERSONS WITH DISABILITIES WAS MORE THAN DOUBLE THE AGE-ADJUSTED RATE FOR PERSONS WITHOUT DISABILITIES
  Press Release


Rape and Sexual Assault Among College-age Females, 1995-2013 Compares the characteristics of rape and sexual assault victimization against females ages 18 to 24 who are enrolled and not enrolled in college.
  Press Release | PDF (535K) | ASCII file (53K) | Comma-delimited format (csv) (Zip format)


Crimes Against the Elderly, 2003-2013 Presents estimates on property and fatal and nonfatal violent victimization against persons age 65 or older from 2003 to 2013.
  Press Release | PDF (2.2M) | ASCII file (44K) | Comma-delimited format (CSV) (Zip format 42K)
Part of the Crimes against Persons Age 65 or Older Series

Socio-emotional Impact of Violent Crime Examines victims' socio-emotional problems resulting from violent crime, including moderate to severe distress, problems with family or friend relationships, or problems at work or school.
  Press Release | PDF (1.5M) | ASCII file (56K) | Comma-delimited format (CSV) (Zip format 42K)


Criminal Victimization, 2013 IN 2013 VIOLENT AND PROPERTY CRIME RATES DECLINED AFTER TWO YEARS OF INCREASES
  Part of the Criminal Victimization Series

The Nation's Two Crime Measures Summarizes the U.S. Department of Justice's two primary statistical programs that measure the magnitude, nature and impact of crime in the nation.
  PDF (752K) | ASCII file (13K)


Criminal Victimization, 2013 (Revised) Presents 2013 estimates of rates and levels of criminal victimization in the United States. This bulletin includes violent victimization (rape or sexual assault, robbery, aggravated assault, and simple assault) and property victimization (burglary, motor vehicle theft, and property theft).
  Press Release | PDF (1M) | ASCII file (40K) | Comma-delimited format (CSV) (Zip format 34K)
Part of the Criminal Victimization Series

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Related Links

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