Teachers' blog

2014年12月20日(土)

【Police stops: Part2】

Theme:Kota

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(Contributed by Kota)
 
OK, there are 532,911 data points in this data set. That is the total number of police stops made in New York in 2012. Specifically, these are police stops made in Manhattan, Brooklyn, Bronx, Queens, and Staten Island. I initially wanted to see which area had more police stops. If you look at the first figure, you can clearly see that more police stops were made in Brooklyn. Well, some areas of Brooklyn are dangerous. This makes sense.
 
image10
 
My next question was at what time of the day police officers asked people to stop. The second figure shows a similar pattern among the areas. They do not really make a lot of police stops in the early morning (e.g., 6:00, 7:00, and 8:00). The more time passes by, the more the number of police stops increases. This pattern is prominent in Brooklyn. It seems that the peak time for police stops comes around 20:00 and 21:00. Many people are going home around this time. I guess the graph is showing police’s intention.
 
image11
 
My third question was at which month police officers made more police stops. My initial guess was that they would ask people in summer because more people go out till late night. However, my guess was wrong. Police officers actually made more police stops in winter. I guess this is because it gets dark early in winter.

 
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