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Is the recent increase in national homicide abnormal? Testing the application of fan charts in monitoring national homicide trends over time

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  • Yim, Ha-Neul

    (The University of Texas at Dallas)

  • Riddell, Jordan R.
  • Wheeler, Andrew Palmer

    (Gainwell Technologies)

Abstract

Purpose: The goal of this study is to compare the increase in the 2015 national homicide rate to the historical data series and other violent crime rate changes. Methods: We use ARIMA models and a one-step ahead forecasting technique to predict national homicide, rape, robbery, and aggravated assault rates in the United States. Annual Uniform Crime Report data published by the Federal Bureau of Investigation are used in our analysis. Results: The 2015 homicide rate increased above the 90% prediction interval for our model, but not more conservative intervals. Predictions intervals for other national level crime rates consistently produced correct coverage using our forecasting approach. Conclusions: Our findings provide weak evidence that the national homicide rate spiked in 2015, though data for 2016 – 2018 do not show a continued anomalous increase in the U.S. homicide rate. Data and code to replicate the findings can be downloaded from https://www.dropbox.com/sh/3086vtoqly5qho6/AABq_weh2LTMtBp426vhZ0EHa?dl=0

Suggested Citation

  • Yim, Ha-Neul & Riddell, Jordan R. & Wheeler, Andrew Palmer, 2019. "Is the recent increase in national homicide abnormal? Testing the application of fan charts in monitoring national homicide trends over time," SocArXiv 7g32n_v1, Center for Open Science.
    • Handle: RePEc:osf:socarx:7g32n_v1
    DOI: 10.31219/osf.io/7g32n_v1
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