While there is no obvious difference in terms of percentage among five boroughs (shown in Fig.2), we can find the pattern within each boroughs. According to Fig. 4, downtown Manhattan, East Harlem, Jackson Height, Murray Hill, Greenwood Heights, and Flatbush have highest scores, while Midtown and Upper Manhattan, Staten Island, Greenpoint and Bushwick in Brooklyn, and Sunnyside in Queens have lowest violation scores. The result might have correlation with median incomes and population density in each area.
3. Time Series Analysis
Since the inspection is surprised and will not notice the restaurant owner beforehand, the time of inspections might be correlated to scores.