Showing 1 – 6 of 6 results.
Curated
Evaluation of the Phoenix, Arizona, Homicide Clearance Initiative, 2003-2005 (ICPSR 26081)
Released/updated on: 2011-07-05
Geographic coverage: United States, Phoenix, Arizona
Time period: 2003-07-01--2005-06-30
The purpose of the study was to conduct a process and outcome evaluation of the Homicide Clearance Project in the Phoenix, Arizona Police Department. The primary objective of the Homicide Clearance Project was to improve homicide clearance rates by increasing investigative time through the transfer of four crime scene specialists to the homicide unit. In 2004, the Phoenix Police Department received a grant from the Bureau of Justice Assistance providing support for the assignment of four crime scene specialists directly to the department's Homicide Unit. Responsibilities of the crime scene specialists were to collect evidence at homicide scenes, prepare scene reports, develop scene diagrams, and other supportive activities. Prior to the project, homicide investigators were responsible for evidence collection, which reduced the time they could devote to investigations. The crime scene specialists were assigned to two of the four investigative squads within the homicide unit. This organizational arrangement provided for a performance evaluation of the squads with crime scene specialists (experimental squads) against the performance of the other squads (comparison squads). During the course of the evaluation, research staff coded information from all homicides that occurred during the 12-month period prior to the transfers (July 1, 2003 - June 30, 2004), referred to as the baseline period, the 2-month training period (July 1, 2004 - August 31, 2004), and a 10-month test period (September 1, 2004 - June 30, 2005). Data were collected on 404 homicide cases (Part 1), 532 homicide victims and survivors (Part 2), and 3,338 records of evidence collected at homicide scenes (Part 3). The two primary sources of information for the evaluation were investigative reports from the department's records management system, called the Police Automated Computer Entry (PACE) system, and crime laboratory reports from the crime laboratory's Laboratory Information Management System (LIMS). Part 1, Part 2, and Part 3 each contain variables that measure squad type, time period, and whether six general categories of evidence were collected. Part 1 contains a total of 18 variables including number of investigators, number of patrol officers at the scene, number of witnesses, number of crime scene specialists at the scene, number of investigators collecting evidence at the scene, total number of evidence collectors, whether the case was open or closed, type of arrest, and whether the case was open or closed by arrest. Part 2 contains a total of 37 variables including victim characteristics and motives. Other variables in Part 2 include an instrumental/expressive homicide indicator, whether the case was open or closed, type of arrest, whether the case was open or closed by arrest, number of investigators, number of patrol officers at the scene, number of witnesses, and investigative time to closure. Part 3 contains a total of 46 variables including primary/secondary scene indicator, scene type, number of pieces of evidence, total time at the scene, and number of photos taken. Part 3 also includes variables that measure whether 16 specific types of evidence were found and the number of items of evidence that were collected for 13 specific evidence types.
Curated
Frequency of Arrest of the Young, Chronic, Serious Offender Using Two Male Cohorts Paroled by the California Youth Authority, 1981-1982 and 1986-1987 (ICPSR 2588)
Released/updated on: 2005-11-04
Geographic coverage: United States, California
This study investigated the ways in which active offenders and their behavior patterns are related to individual characteristics. Data were collected to explore topics such as the nature of individual offending behavior, including offense mix and specialization, the frequency of offending, and the characterization of offender types. To address these issues, the post-release arrest patterns of two cohorts of male youths paroled by the California Youth Authority in 1981-1982 and 1986-1987 were examined. The project focused on modeling the frequency of recidivism and the correlates of arrest frequency. The frequency of arrest was measured during two periods: the first year following release and years two and three following release. Criminal justice variables in this collection provide information on county-level crime and clearance rates for violent and property crimes known to the police. Measures of parolees' criminal history include length of incarceration prior to current commitment, frequency of arrest, age at first arrest, and calculated criminal history scores. Personal and family characteristics include previous violent behavior, alcohol and drug abuse, family violence, neglect or abuse, degree of parental supervision, parental criminality, education, and school disciplinary problems. Demographic variables include age and race of the subjects.
Curated
Uniform Crime Reports, 1966-1976: Data Aggregated by Standard Metropolitan Statistical Areas (ICPSR 7743)
Released/updated on: 1992-02-16
Geographic coverage: United States
Time period: 1966-01-01--1976-01-01
This data collection contains a revised SMSA (Standard Metropolitan Statistical Area) aggregate version of the FBI's Uniform Crime Reports (UCR) statistics gathered from 1966-1976, in which original UCR agency records are combined to produce several types of crime rates, by SMSA, for eight crimes. The data were prepared by the Hoover Institution for Economic Studies of the Criminal Justice System, at Stanford University. The data in the file are an aggregation of all relevant law enforcement reporting agencies into 291 SMSAs, and corresponding approximate aggregations of crime rates and dispositions. Each record contains crime rates for one SMSA in one specific year, with data including annual statistics of eight index crimes, i.e., murder, manslaughter, rape, robbery, assault, burglary, larceny, and motor vehicle theft. Calculations include offense-based clearance rates (the number of clearances of juvenile clearances per reported offense), clearance-based rates (the number of persons charged per offense cleared by arrest), and charge-based rates (the number of persons whose cases were disposed in a particular manner per person charged). A related study is UNIFORM CRIME REPORTS, 1966-1976 (ICPSR 7676).
Curated
Uniform Crime Reports: Monthly Weapon-Specific Crime and Arrest Time Series, 1975-1993 [National, State, and 12-City Data] (ICPSR 6792)
Released/updated on: 2005-11-04
Geographic coverage: United States
Time period: 1975-01-01--1993-01-01
These data were prepared in conjunction with a project using Bureau of Labor Statistics data (not provided with this collection) and the Federal Bureau of Investigation's Uniform Crime Reporting (UCR) Program data to examine the relationship between unemployment and violent crime. Three separate time-series data files were created as part of this project: a national time series (Part 1), a state time series (Part 2), and a time series of data for 12 selected cities: Baltimore, Buffalo, Chicago, Columbus, Detroit, Houston, Los Angeles, Newark, New York City, Paterson (New Jersey), and Philadelphia (Part 3). Each data file was constructed to include 82 monthly time series: 26 series containing the number of Part I (crime index) offenses known to police (excluding arson) by weapon used, 26 series of the number of offenses cleared by arrest or other exceptional means by weapon used in the offense, 26 series of the number of offenses cleared by arrest or other exceptional means for persons under 18 years of age by weapon used in the offense, a population estimate series, and three date indicator series. For the national and state data, agencies from the 50 states and Washington, DC, were included in the aggregated data file if they reported at least one month of information during the year. In addition, agencies that did not report their own data (and thus had no monthly observations on crime or arrests) were included to make the aggregated population estimate as close to Census estimates as possible. For the city time series, law enforcement agencies with jurisdiction over the 12 central cities were identified and the monthly data were extracted from each UCR annual file for each of the 12 agencies. The national time-series file contains 82 time series, the state file contains 4,083 time series, and the city file contains 963 time series, each with 228 monthly observations per time series. The unit of analysis is the month of observation. Monthly crime and clearance totals are provided for homicide, negligent manslaughter, total rape, forcible rape, attempted forcible rape, total robbery, firearm robbery, knife/cutting instrument robbery, other dangerous weapon robbery, strong-arm robbery, total assault, firearm assault, knife/cutting instrument assault, other dangerous weapon assault, simple nonaggravated assault, assaults with hands/fists/feet, total burglary, burglary with forcible entry, unlawful entry-no force, attempted forcible entry, larceny-theft, motor vehicle theft, auto theft, truck and bus theft, other vehicle theft, and grand total of all actual offenses.
Curated
Uniform Crime Reports: National Time-Series Community-Level Database, 1967-1980 (ICPSR 8214)
Released/updated on: 2006-01-12
Geographic coverage: United States
Time period: 1967-01-01--1980-01-01
The Uniform Crime Reports National Time-Series Data, 1967-1980, include detailed criminal offense and clearance information submitted monthly by over 3,000 consistently reporting law enforcement agencies in the United States. These data, provided in annually pooled cross-sections, were processed at the Center for Applied Social Research, Northeastern University, Boston, Massachusetts to produce easily accessible and highly reliable time-series data on officially reported crime. Originally provided by the Federal Bureau of Investigation (FBI), these data exclude Uniform Crime Report (UCR) data from infrequently reporting law enforcement agencies. In general, only those agencies that submitted ten or more monthly reports in every year during 1967 through 1980 are included in this collection. The data include detailed breakdowns of offenses and clearances taken from disaggregated UCR Return A tapes. Of particular interest are weapon-specific robbery and assault variables, types of rape, burglary, larceny, and motor vehicle theft, and clearances by arrest (or other exceptional means) of adults and juveniles for each offense sub-type. Both monthly and annual counts of these are available. Finally, as an aid to the user, each agency is identified by its FBI "ORI Code" as well as a sequential case number produced and documented by ICPSR in the codebook's appendix. Cases also may be identified by geographic region, state, SMSA, county, population size and group, and frequency of reporting.
Curated
Uniform Crime Reports: Offenses Known and Clearances by Arrest Time Series Data, 1965-1983 (ICPSR 8631)
Released/updated on: 2006-01-12
Geographic coverage: United States
Time period: 1965-01-01--1983-01-01
The Uniform Crime Reporting (UCR) Program Data is a system designed to monitor the incidence of crime and the activities of law enforcement agencies at the community level. Participating local law enforcement agencies throughout the nation report regularly (usually on a monthly basis) on the volume of selected crimes and arrests and also on the levels of police personnel and types of police activities. This collection consists of time series data relating to offenses known and clearances by arrest for the years 1965-1983, 1970-1983, and 1975-1983. Only those agencies that consistently reported over the three time periods of the study were included. Consistently reporting agencies were defined as those agencies that were in operation during the time of the study and submitted nine or more monthly reports during the calendar year for the three specified time periods. Variables include number of actual offenses reported to the police, the total number of offenses for each category cleared by arrest, and the number of clearances by arrest involving only persons under 18 years of age. Crimes covered are criminal homicide, forcible rape, robbery, assault, burglary, larceny-theft, and motor vehicle theft.