CHRI subpopulation analysis:
Real-world examples and more

2018 Eastern Regional Training Institute for SACs, JRSA

Bobae Kang, Illinois SAC

December 5, 2018


More on Illinois SAC: http://www.icjia.state.il.us/research/overview

This presentation is . . .

Example 1:
First-time firearm offenders

#2016-BJ-CX-K024

How do first-time firearm offenders
behave differently?

Highlights

  • Sample construction
    • Coarsened exact matching
  • Combining multiple data sources
    • More nuanced “time to event”

Example 1: Sample construction

Example 1: Sample construction

Example 1: Coersened exact matching ( @devmotivation 2017 )

Example 1: Multiple data sources

Example 1: Time to event

Example 1: Time to event

Example 1: Time to event

Example 2:
Registered sex offenders

#2017-BJ-CX-K016

To what extent the registry changes over time?
Who are the registered sex offenders & what does their criminal history look like?

Highlights

  • Sex Offender Registry (SOR) table
  • Combining multiple data sources
    • More nuanced “current residence”
    • “Criminal history analysis group”

Example 2: SOR table


Example 2: Multiple data sources

Example 2: Current residence

Example 2: Current residence

Example 2: Crinimal history analysis group


Example 2: Identifying the “registering event”

Programmatic approach
to research

A programmatic approach to research
relies on computer programs
to organize and carry out
research tasks.

Basic workflow

  1. Set up a research project directory
  2. Write and run computer programs to
    • obtain datasets
    • prepare clean datasets
    • conduct analyses
    • generate reports, slides, etc.
  3. Share results

Research directory example

Key benefits

  • Automation
  • Flexibility
  • Reproducibility

Thank you :)

References

Slides
https://bobaekang.github.io/jrsa2018eastern/slides

ICJIA R Workshop resources
https://bobaekang.github.io/icjia-r-workshop/