For a class project, I conducted a fractional response model on the levels of major felonies in New York City by Community District (CD) in 2019. The map on the right shows the percentage of total major felonies per CD relative to the entire city. Manhattan CD 5 and Brooklyn CD 5 had the highest levels of felonies in 2019 based upon NYPD data that I analyzed with Excel, SAS, and STATA (NYC Open Data NYPD 2021).
The purpose of this study was to evaluate whether housing court cases (NYC Open Data Housing Litigations 2021), housing unit vacancies, unemployment, new building construction, building demolitions, and disadvantaged socioeconomic status factors have statistically significant effects on crime levels in New York City neighborhoods at the community district level in 2019. The goal is to identify public policy initiatives that may promote crime reduction of major felonies by New York City. From the 2019 population of 59 community districts in New York City, I find through a fractional response model with probit distribution as the link function regression that housing court cases and housing vacancies, both measures of neighborhood decline, encourage major felonies. The strongest positive effect on crime was housing court cases. At the neighborhood level, Staten Island 2, a community selected for detailed marginal effects has smaller magnitude increases in crime as compared with Manhattan 10 or the other three selected community districts in Bronx 5 and Brooklyn 4 and 16. Manhattan 10, or Central Harlem, has the biggest magnitude increase out of the five selected neighborhoods in felony crimes as related to housing court cases and vacant buildings. Underlying neighborhood factors that are not yet identified seem to create variation across the city in crime level response to housing court cases and vacancies. For every unit increase in the HPD court cases per 1,000 population in a CD starting at the average, the crime level increases by 0.26 percent, all else constant. The magnitude of this effect is not large but is statistically significant. Likewise, for every unit increase in the percent of vacant units in a CD starting at the average, the crime level increases by 0.13 percent, all else constant. The magnitude of this vacant buildings effect is even smaller, but it is statistically significant.
My future research will consider likely endogeneity issues, such as existing neighborhood conditions, by possibly utilizing the simultaneous equations fractional response model.
Source of Data:
"NYC Open Data: Housing Litigations." b. Web. 10/20/21.
https://data.cityofnewyork.us/Housing-Development/Housing-Litigations/59kj-x8nc
"NYC Open Data: NYPD Complaint Data Historic." 2021. Web. 10/20/21 .
https://data.cityofnewyork.us/Public-Safety/NYPD-Complaint-Data-Historic/qgea-i56i