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Predicted Homicide Rate for 2015 St. Louis James Francois Brad Precht Sophia Russo Ken Webb Xichen Liu.

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Presentation on theme: "Predicted Homicide Rate for 2015 St. Louis James Francois Brad Precht Sophia Russo Ken Webb Xichen Liu."— Presentation transcript:

1 Predicted Homicide Rate for 2015 St. Louis James Francois Brad Precht Sophia Russo Ken Webb Xichen Liu

2 Project Objective To locate the best forecasting model to predict the Homicide rate for the City of St. Louis for 2015. To show where the Homicides will happen, and how many will happen in each area.

3 Time Series Analysis and Forecasting The objective of time series analysis is to discover a pattern in the historical data or time series; and then extrapolate the pattern show show predicted values for the future. The forecast is based solely on past values of the variable and/or on past forecast errors.

4 Time Series Analysis and Forecasting Why it is useful to predict the Homicide rate. Since the Homicide rate has no linear format, the use of time series analysis will give the best predicted values for the future based on historic data.

5 Forecast Error The key concept associated with measuring forecast accuracy is forecast error, which shows the difference between the predicted value and the actual value, as defined by Forecast Error = Actual Value - Forecast

6 Mean Squared Forecast Error Another measure that negates the problem of positive and negative forecast errors offsetting each other is obtained by computing the average of the squared forecast errors. Mean Squared Forecast Error = average of the sum of squared forecast errors

7 Percentage Error The average of the absolute values of the percentage forecast errors. This was used to see how good of a prediction we were getting for each neighborhood. Using percentages instead of unit numbers gives a more universal understanding. Ex: One may not know if being off by 5 murders is a lot, but it is universally understood that being off by 80% is a large amount

8 District 1 Homicide Forecast District 1 makes up 11% of the overall predicted Homicide Rate for St. Louis City.

9 District 1 Homicide Forecast By Neighborhood

10 District 2 Homicide Forecast District 2 makes up 3% of the overall predicted Homicide Rate for St. Louis City.

11 District 2 Homicide Forecast By Neighborhood

12 District 3 Homicide Forecast District 3 makes up 11% of the overall predicted Homicide Rate for St. Louis City.

13 District 3 Homicide Forecast By Neighborhood

14 District 4 Homicide Forecast District 4 makes up 15% of the overall predicted Homicide Rate for St. Louis City.

15 District 4 Homicide Forecast By Neighborhood

16 District 5 Homicide Forecast District 5 makes up 27% of the overall predicted Homicide Rate for St. Louis City.

17 District 5 Homicide Forecast By Neighborhood

18 District 6 Homicide Forecast District 6 makes up 34% of the overall predicted Homicide Rate for St. Louis City.

19 District 6 Homicide Forecast By Neighborhood

20 Predicted Homicide Rate for St. Louis City

21 To Summarize: Homicides in St. Louis AreasPredicted Homicides 2015 District 114 District 23.25 District 313.5 District 418.75 District 534 District 642.5 St. Louis City126

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