Find the unit of analysis in the following sentences: 1) “Taking into account preexisting traffic fatality trends and several other relevant factors, the implementation of the emergency cellular telephone program resulted in a substantial and permanent reduction in the monthly percentage of alcohol-related fatal crashes.” (D’Alessio, Stolzenberg, and Terry 1999, 463-464) 2) “The survey robbery rate was highest in Canada and the Netherlands, and lowest in Scotland…In 1999 the survey robbery rate was lowest in the United States.” (Farrington et al. 2004, xii) 3) “On average, probationers were 31 years old, African American, male, and convicted of drug or property offenses. Most lived with family and although they were not married, many were in exclusive relationships (44 percent) and had children (47 percent).” (MacKenzie et al. 1999, 433) 4) “Seventy-five percent (n=158) of the cases were disposed at district courts, and 3 percent (n=6) remained pending. One percent of the control and 4 percent of the experimental cases were referred to drug treatment court.” (Taxman and Elis 1999, 42). Find the unit of analysis in the following sentences: 5) “The department’s eight Field Operations Command substations (encompassing 20 police districts and 100 patrol beats) comprised the study’s cross-sectional units. From January 1989, a period of 43 months, data were collected monthly from each substation for a total of 344 cases.” (Kessler 1999, 346)