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Abstract
Background
As rapid response has been a key policing strategy for police departments around the globe, so has police response time been a key performance indicator. This scoping review maps and assesses the variables that predict police response time.

Methods
This review considers empirical studies, written in english, that include quantitative data from which an association between the outcome variable police response time and any predictor can be observed or derived. This review provides both a narrative synthesis as well as what we termed a hybrid synthesis, a novel way of synthesizing a large quantitative dataset which is considered too rich for a mere narrative synthesis and yet does not allow for meta-analysis.

Results
The search, screening and selection process yielded 39 studies, which presented 630 associations between 122 unique predictor variables and police response time. In order to present the results in a digestible way, we classified these into categories and subcategories. All methodological steps and the findings are made public: https://github.com/timverlaan/prt.

Conclusions
Most of the conclusion and discussion focuses on lessons learned and recommendations for future research, as it proved hard to draw any definitive conclusions on causal factors related to police response time. We recommend that future studies clearly describe mechanisms, focus on the components of police response time (reporting time, dispatch time, travel time—or a combination of these), attempt to standardize predictors and outcome variables, and we call for more research into reporting time. We conclude this review with a first attempt at deriving a causal model of police response time from the subcategories of predictor variables we observed in the empirical studies included in this review.
Trail Registration: https://osf.io/hu2e9.

AbstractThis preregistered scoping review provides an account of studies which have examined the spatial patterning of emergency reactive police demand (ERPD) as measured by calls for service data. To date, the field has generated a wealth of information about the geographic concentration of calls for service, but the information remains unsynthesised and inaccessible to researchers and practitioners. We code our literature sample (N = 79) according to the types of demand studied, the spatial scales used, the theories adopted, the methods deployed and the findings reported. We find that most studies focus on crime-related call types using meso-level (e.g., neighborhood) spatial scales. Descriptive methods demonstrate the non-random distribution of calls, irrespective of their type, while correlational findings are mixed, providing minimal support for theories such as social disorganization theory. We conclude with suggestions for future research, focusing on how the field can better exploit open data sources to 'scale-up' analyses.

AbstractAnalyses of emergency calls for service data in the United States suggest that around 50% of dispatched police deployment time is spent on crime-related incidents. The remainder of time is spent in a social service capacity: attending well-being checks and resolving disturbances, for instance. These findings have made a considerable contribution to the discourse around public perceptions of the police and the distribution of public funds towards (or away) from law enforcement. Yet, an outstanding issue remains. No investigation has been undertaken into whether findings are robust to the different ways in which 'time spent' is operationalized in these studies. Using dispatch data for Amsterdam during 2019, this study compares three operationalizations of 'time spent'. Additionally, in order to provide some context on the potential mechanisms through which these different operationalizations might yield different results, we report on dispatch numbers per incident category and provide an initial exploration into 'multi-dispatch' incident types. We find that general proportional breakdowns are fairly robust to the time measure used. However, for some incident categories (e.g. Health) and incident types (e.g. Shootings), analyzed in isolation, the results are not robust to the different operationalizations. We propose that the mechanism explaining this lack of robustness can be traced to the high dispatch numbers for specific incident categories and types, particularly those with an imminent threat to life.Preregistration: This study has been preregistered under the title: Scale and composition of emergency reactive police demand in Amsterdam, Netherlands (https://osf.io/qgwv6/).

Large-scale online marketplace data have been repeatedly used to test sociological theories on trust between strangers. Most studies focus on sellers' aggregate reputation scores, rather than on buyers' individual decisions to trust. Theoretical predictions on how repeated exchanges affect trust within dyads and how buyers weigh individual experience against reputation feedback from other actors have not been tested directly in detail. What do buyers do when they are warned not to trust someone they have trusted many times before? We analyze reputation effects on trust at the dyadic and network levels using data from an illegal online drug marketplace. We find that buyers' trust decisions are primarily explained by dyadic embeddedness - cooperative sellers get awarded by repeated exchanges. Although buyers take third-party information into account, this effect is weaker and more important for first-time buyers. Buyers tend to choose market exit instead of retaliation against sellers after negative experiences.

In the Netherlands, charitable behavior for international development purposes is subject to important changes. Whereas established development organizations suffer from a declining support base, private development initiatives (PDIs) that execute concrete, small-scale projects within direct personalized aid networks can count on increasing enthusiasm from individual donors of money and time. We investigate to what extent cost-benefit evaluations of volunteers (supply side) and characteristics of PDIs (demand side) affect the time allocation for volunteering in these organizations. The study is based on a survey among 661 volunteers active in Dutch PDIs. PDI volunteers face time and budget restrictions, partly due to their position on the (paid) labor market. Volunteers who are skeptical toward established development organizations increase voluntary time investment in PDIs. Corroborating the proximity hypothesis, volunteers perceiving a smaller distance to beneficiaries, spend more volunteering hours in PDIs. Volunteers also spend more hours volunteering for PDIs with larger budgets and more staff.

Xenophobia among youngsters: the influence of interethnic contact. This study examines xenophobic attitudes of high school pupils. It answers the questions: To what extent do high school pupils from different ethnic backgrounds hold xenophobic attitudes? And to what are these attitudes
related with interethnic contact? Scientific progress is made in three ways. Firstly, attitudes of high school pupils from both the ethnic majority (Dutch) and the ethnic minority groups (Turks, Moroccans, and Caribbean) are examined. Secondly, the impact of positive as well as negative interethnic
contact within and outside the school environment is determined. And thirdly, hypotheses about interethnic contact are tested while simultaneously controlling for alternative mechanisms that explain xenophobic attitudes. The results show that most pupils have a low level of xenophobia. In
addition, the level of xenophobia is less when pupils evaluate their interethnic contacts both within and outside the school environment as positive and higher when they perceive these contacts as negative. However, the impact of positive interethnic contact in class disappears or even reverses
when multiculturalism is stressed more during lessons.

The co-evolution of friendship relations and delinquent behaviour among Dutch adolescents .This article focuses on two research questions. To what degree is similarity in delinquent behaviour among Dutch secondary school students explained by selection and influence processes? And
to what extent is the effect of friends' delinquency on adolescents' delinquency level moderated by characteristics of the friendship relation? Hypotheses were drawn from Sutherland's Differential Association Theory, its extension by Burgess and Akers, and Hirschi's
Social Control Theory. The hypotheses were tested with longitudinal social network data, using the recently developed software program 'Simulation Investigation for Empirical Network Analysis' (SIENA). The network data were gathered among lower educated students of twelve secondary
schools in the Dutch province of South Holland during a three-year period. The analyses suggest that adolescents tend to adjust their behaviour to the delinquency level of their peers (influence process), and tend to be friends with others who have a similar level of delinquency (selection
process). Further, the results indicate that attachment to friends, time spent with friends and social pressure of friends do not affect the influence of peers on adolescents' delinquency level.

According to crime pattern theory, offenders are likely to select crime locations within their awareness space. Previous studies have shown that offenders often commit crimes within their current and former residential areas and in areas they previously targeted. However, offenders' awareness spaces obviously consist of more locations that potentially influence their crime location choices. This study examines the importance of the residential areas of offenders' family members. Most offenders visit their families at least occasionally and consequently get familiar with the areas in which their families live. It is hypothesized that family members' residential areas are at increased risk of being targeted. Unique data were used to reconstruct residential histories of the parents, siblings, and children of 7,910 offenders who committed 19,420 offenses. The results of discrete spatial choice models showed that residential areas of family members are indeed at increased risk of being targeted. Current familial residential areas had stronger and more consistent effects than had former familial residential areas. Effects were strongest for the residential areas of offenders' children compared with those of their parents and siblings. The residential areas of male and female family members affected the crime location choices of male and female offenders equally.