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Analysis of property sales in the vicinity of 1,294-acre Pennypack Park in Philadelphia indicates a statistically significant rise in land value with closeness to park, when allowance is made for effect of type of house, year of sale, and special characteristics such as location on corner of block. Location rent due to the park ranges from approximately $11,500 per acre 40 feet from the park to $1,000 at 2,500 feet. It accounts for 33 percent of land value at 40 feet, 9 percent at 1,000 feet, and 4.2 percent at 2,500 feet. Each acre of parkland may be said to generate a value of $2,600 in location rent.

Ordinary kriging, a spatial interpolation technique, is commonly used in social sciences to estimate neighborhood attributes such as physical disorder. Universal kriging, developed and used in physical sciences, extends ordinary kriging by supplementing the spatial model with additional covariates. We measured physical disorder on 1,826 sampled block faces across four U.S. cities (New York, Philadelphia, Detroit, and San Jose) using Google Street View imagery. We then compared leave-one-out cross-validation accuracy between universal and ordinary kriging and used random subsamples of our observed data to explore whether universal kriging could provide equal measurement accuracy with less spatially dense samples. Universal kriging did not always improve accuracy. However, a measure of housing vacancy did improve estimation accuracy in Philadelphia and Detroit (7.9 percent and 6.8 percent lower root mean square error, respectively) and allowed for equivalent estimation accuracy with half the sampled points in Philadelphia. Universal kriging may improve neighborhood measurement.

The 1992 Los Angeles riot, the boycotts of Korean-owned businesses, and the 1995 firebombing of a Jewish-owned store in New York's Harlem brought concerns about race and ethnic relations in black neighborhoods to the fore. Images of conflict seared into the public consciousness that black communities are fraught with racial animosity, with immigrant merchants pitted against black customers. The merchant- customer relationship has been cited as a catalyst to such conflicts. This image of conflict, however, is inconsistent with most merchant-customer interactions and does not reflect the full range of commercial life in black communities. Most merchant- customer interactions are civil and ordinary. Civil relations prevail because merchants foster civility, abate tensions, and thwart conflict. However, under conditions of extreme inequality, small events can trigger racial anger, and the symbolic significance of nonblack-owned businesses can become a stimulus of motivations for protest that leads to boycotts and firebombings. This study is based on 75 in-depth interviews of African American, Jewish, and Korean merchants and on 75 in-depth interviews with black customers and both participant and nonparticipant observation at five research sites in New York City and Philadelphia.

Men are at significantly greater risk than women to violent crime victimization in the US, especially in the public sphere. Despite this, their fears and vulnerabilities have received considerably less attention in recent social discourse than have women. Men's risk in, and fear of, public space is overshadowed by their apparent fearlessness in public space. This paper begins to address this apparent paradox using the conceptual lenses of masculinity and control. I explore fear and fearlessness among men as objects and subjects of masculinity. Stated fearlessness among men is counterbalanced by a chronic fear of violent crime victimization. Conditioned fearlessness combines with actual risk and chronic fear to shape men's experiences in the public sphere. I study the dynamics of men's fear using data gathered from a group of young men and women in Philadelphia. Gendered differences in fear and how environments are perceived and judged as to their relative safety are demonstrated and explored. Compared to women's fears and perceived geographical vulnerabilities, the men of this study demonstrate a persistent and chronic wariness of their environmental context that precedes any judgment of perceived safety. Violence and fear among both men and women in this study is further explained as a function of racism and economic marginalization.

Cellphones provide a unique opportunity to examine how new media both reflect and affect the social world. This study suggests that people map their understanding of common social rules and dilemmas onto new technologies. Over time, these interactions create and reflect a new social landscape. Based upon a year-long observational field study and in-depth interviews, this article examines cellphone usage from two main perspectives: how social norms of interaction in public spaces change and remain the same; and how cellphones become markers for social relations and reflect tacit pre-existing power relations. Informed by Goffman's concept of cross talk and Hopper's caller hegemony, the article analyzes the modifications, innovations and violations of cellphone usage on tacit codes of social interactions.

The development and proliferation of mobile social networks have the potential to transform ways that people come together and interact in public space.These services allow new kinds of information to flow into public spaces and, as such, can rearrange social and spatial practices. Dodgeball is used as a case study of mobile social networks. Based on a year-long qualitative field study, this article explores how Dodgeball was used to facilitate social congregation in public spaces and begins to expand our understanding of traditional notions of space and social interaction. Drawing on the concept of parochial space, this article examines how ideas of mobile communication and public space are negotiated in the everyday practice and use of mobile social networks.