Is Robbery Becoming More Violent an Analysis of Robbery Murder Trends Since 1968 Philip J
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CORE Metadata, citation and similar papers at core.ac.uk Provided by Northwestern University Illinois, School of Law: Scholarly Commons Journal of Criminal Law and Criminology Volume 76 | Issue 2 Article 4 1985 Is Robbery Becoming More Violent an Analysis of Robbery Murder Trends Since 1968 Philip J. Cook Follow this and additional works at: https://scholarlycommons.law.northwestern.edu/jclc Part of the Criminal Law Commons, Criminology Commons, and the Criminology and Criminal Justice Commons Recommended Citation Philip J. Cook, Is Robbery Becoming More Violent an Analysis of Robbery Murder Trends Since 1968, 76 J. Crim. L. & Criminology 480 (1985) This Criminology is brought to you for free and open access by Northwestern University School of Law Scholarly Commons. It has been accepted for inclusion in Journal of Criminal Law and Criminology by an authorized editor of Northwestern University School of Law Scholarly Commons. 0091-4169/85/7602-480 "rHEJOURNAL OF CRIMINAL LAw & CRIMINOLOGY Vol. 76, No. 2 Copyright 0 1985 by Northwestern University, School of Law hinted in t'S.I. CRIMINOLOGY IS ROBBERY BECOMING MORE VIOLENT? AN ANALYSIS OF ROBBERY MURDER TRENDS SINCE 1968* PHILIP J. COOK** I. INTRODUCTION "Manchild 1984 is the product of a society so rife with violence that killing a mugging or robbery victim is now fashionable." -Claude Brown1 Robbery is an intrinsically violent crime, and, in fact, is defined as theft accomplished by force or the threat of physical injury. In approximately 2,000 cases in the United States each year, robbery violence proves fatal to the victim.2 This is a relatively rare event given that there are more than one million robberies annually.3 Nevertheless, the number of robbery homicides is a major contribu- tor to the public's fear of this crime. From time to time, public concern is enhanced by reports that robbers are becoming more violent. One example from the popular press reports: Another frightening difference in the crime picture is that life now seems pitifully cheap. Law-enforcement officials think they have wit- nessed a shift toward gratuitous slaughter. "It used to be 'Your money or your life,' " says assistant Bronx district attorney William Flack. * This research was supported by a grant from the National Institute of Justice. David Hintz supplied able programming assistance. This draft benefitted fion Lois Mock's suggestions. ** Professor of Public Policy Studies and Economics, Duke University. Ph. D., Uni- versity of California, Berkeley, 1973; B.A., University of Michigan, 1968. 1 Brown, Manchild in Harlem, N.Y. Times, Sept. 16, 1984 (Magazine), at 36, 44. 2 P. CooK, ROBBERY IN THE UNITED STATES: AN ANALYSIS OF RECENT TRENDS AND PATrERNS 5 (Nat'l Inst. ofJustice 1983). 3 Id. at 3. 480 1985] ROBBERY MURDER TRENDS SINCE 1968 481 "Now it's 'Your money and your life.' "4 Claude Brown offers a number of explanations for the vicious- ness of youths in inner cities. One explanation is that these youths were often eyewitnesses at an impressionable age to "the broad- daylight slayings so typical of the urban drug wars of the 1970's. When they were six, seven, eight or so, they saw friends, neighbors, relatives and total strangers brutally murdered, and seldom heard of 5 anyone even being arrested for any of the slayings." Before establishing a culprit for the increase in robbery vio- lence, however, it is necessary to investigate systematically whether robbery violence actually has increased. The central assertion, ex- pressed in the uncolorful language of empirical science, is that the percentage of all robberies resulting in serious injury or death has increased substantially in the recent past. Because suitable data on the incidence of robbery injury are not available, 6 this study focuses on robbery murders. The principal finding is that the estimated ra- tio of robbery murders to robberies shows no consistent increase during the period 1968-1983. This ratio does increase between 1968 and 1973, remains at a relatively high plateau from 1973 to 1979, and drops rather sharply after 1979. This result, if taken at face value, suggests that popular concerns about the increasing bloodthirstiness of robbers are rather dated. Before documenting these results concerning the murder-rob- bery ratio, two related trends in criminal homicide should be ex- plored: (1) the trend in the number of robbery murders and other felony murders per capita, and (2) the trend in the relative composi- tion of criminal homicide in different circumstances. These data help illuminate the common assertion that the nature of homicide has changed dramatically in recent years, with killings resulting from arguments between friends or relations displaced in relative 4 The Plague of Violnt Crime, NEWSWEEK, Mar. 23, 1981, at 46, 48. 5 Brown, supra note 1, at 54. 6 Some data on the prevalence of serious injury in personal (noncommercial) rob- bery are available from the National Crime Surveys (NCS) for the years 1973-1981. U.S. DEP'T OF JUSTICE, BUREAU OF JUSTICE STATISTICS ( Formerly the Lw ENFORCEMENT ASSISTANCE ADMIN.), CRIMINAL VICTIMIZATION IN THE UNITED STATES, 1973-1981. Dur- ing this period, the percentage of robbery victims seeking medical treatment at a hospi- tal ranged from 10.6 percent in 1976 to 8.5 percent in 1977. U.S. DEP'T OFJUSTICE, LAW ENFORCEMENT ASSISTANCE ADMIN., CRIMINAL VICTIMIZATION IN THE UNITED STATES, 1976, at 99; U.S. DEP'T OF JUSTICE, LAW ENFORCEMENT ASSISTANCE ADMIN., CRIMINAL VICTIMIZATION, 1977, at 57. Because the standard error on each of these annual injury rates is about 1.2 percent, and because there is no obvious trend in these statistics, it is plausible that the observed variation is random variation due to sampling error. Unfor- tunately, there are no richer sources of information on national trends in robbery injury. The NCS data are simply too sparse and hence noisy to be useful in the current context. 482 PHILIPJ COOK [Vol. 76 importance by felony murders (particularly in robbery), senseless killings by strangers, and murders that leave the police simply 7 baffled. II. DATA ON ROBBERY AND CRIMINAL HOMICIDE This study is limited to fifty-two of the nation's largest cities- all those, with a few exceptions (due to missing data), that had a population in excess of 250,000 in 1968. This study is thus limited in order to enhance the intertemporal consistency of the data. The bulk of the nation's robberies and robbery murders occurred in these cities. "The 57 cities with populations exceeding 250,000 in 1981 contained only 19 percent of the U.S. population, but reported 61 percent of all robberies. The six largest cities (with eight percent of the population) had 33 percent of the robberies, and New York 8 City alone had 18 percent." Each of these cities reports the number of criminal homicides, robberies, and other "Index" crimes to the FBI on the Return A Form on an annual basis. In addition, each city provides the FBI with a Supplementary Homicide Report (SHR) that includes inci- dent based information for each homicide.9 The result is a micro- data file that includes information on each criminal homicide, in- cluding the circumstance of the killing, the relationship between killer and victim, and the type of weapon used. Beginning in 1973 and again in 1976, the FBI substantially changed the coding scheme for criminal homicides, but there is sufficient consistency in these schemes to permit some intertemporal comparisons for the period since 1968. There are other problems with both the Return A data and the SHR data. Police department Return A counts of the number of robberies are known to understate the actual total because many vic- tims never report robberies to the police and the police sometimes do not record reported robberies as such. The likelihood that a rob- 7 See The Washington Post National Weekly Edition, Mar. 5, 1984, at 32 (quoting Franklin Zimring, law professor at the University of California, Berkeley). "[T]he com- position of homicide has changed-domestic homicides have declined as a proportion of the total .... The new American homicide involves 'puzzling' cases and 'stranger' cases." Id. 8 P. CooK, supra note 2, at 11. 9 The Supplementary Homicide Report (SHR) data did not include information from Houston for the year 1982 and from Jersey City, Akron, and Rochester for the years 1982 and 1983. Estimates for these cities were generated by substituting the Re- turn A homicide count for the SHR total. This total was then allocated among the differ- ent subcategories (robbery-related, unknown circumstances, etc.) by assuming that the distributions of homicides across these categories in the missing years were the same as in the three recent years for which SHR data were available. 1985] ROBBERY MURDER TRENDS SINCE 1968 bery will be reported to and recorded by the police depends in part on its seriousness. Victims are more likely to report gun robberies than other armed robberies, and are more likely to report armed robberies than unarmed robberies. 10 Furthermore, the fraction of all robberies reported to the police (and included in the police de- partments' annual crime reports) differs among cities and varies over time. There is some evidence that the percentage of all rob- beries that are included in police reports has increased from 1973 to 1980. During this period, police-reported robbery rate per capita in the United States increased by 33 percent, while the National Crime Survey's estimate of the robbery rate fell slightly.'I The SHR data also suffer from certain problems. First, a police department's SHR submissions to the FBI often contain a different number of homicides than that department's Return A submissions.