{"id":15945714,"url":"https://github.com/pjsier/strategic-subject-list","last_synced_at":"2025-10-16T11:32:30.101Z","repository":{"id":88910262,"uuid":"89882816","full_name":"pjsier/strategic-subject-list","owner":"pjsier","description":"Looking at arrest and score data from CPD's Strategic Subject List","archived":false,"fork":false,"pushed_at":"2017-06-11T19:54:59.000Z","size":2859,"stargazers_count":4,"open_issues_count":0,"forks_count":0,"subscribers_count":3,"default_branch":"master","last_synced_at":"2025-01-03T23:30:10.966Z","etag":null,"topics":["chicago","cpd"],"latest_commit_sha":null,"homepage":null,"language":"Jupyter Notebook","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/pjsier.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2017-04-30T23:13:10.000Z","updated_at":"2022-06-07T07:11:52.000Z","dependencies_parsed_at":"2023-06-13T02:45:13.992Z","dependency_job_id":null,"html_url":"https://github.com/pjsier/strategic-subject-list","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/pjsier%2Fstrategic-subject-list","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/pjsier%2Fstrategic-subject-list/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/pjsier%2Fstrategic-subject-list/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/pjsier%2Fstrategic-subject-list/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/pjsier","download_url":"https://codeload.github.com/pjsier/strategic-subject-list/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":240250354,"owners_count":19771778,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["chicago","cpd"],"created_at":"2024-10-07T09:05:48.545Z","updated_at":"2025-10-16T11:32:25.066Z","avatar_url":"https://github.com/pjsier.png","language":"Jupyter Notebook","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Strategic Subject (SSL) Data Analysis\n\nThe Chicago Police Department recently released de-identified information from arrest data used\nin its Strategic Subject List (SSL) model which assigns scores from 1-500 to individuals\nbased on their likelihood to become \"parties to violence\" in the future,\nwhether as potential victims or perpetrators. The information is on the [Chicago\nOpen Data Portal](https://data.cityofchicago.org/Public-Safety/Strategic-Subject-List/4aki-r3np).\nThe model is said to have gone through at least 5 iterations, with this being one\nof the later versions.\n\nThe data description indicates that this is the output of the algorithm being\napplied to all CPD arrest data in that time period (August 1, 2012 through July 31,\n2016), and not necessarily the list itself. However, the distinction between \"high\npriority\" individuals--often cited as being between 400 and 1,400 people--is not\nclear.\n\nAdditionally, according to [CPD Special Order 09-11](http://directives.chicagopolice.org/directives/data/a7a57b85-155e9f4b-50c15-5e9f-7742e3ac8b0ab2d3.html?hl=true)\nthe default view for the Strategic Subjects List dashboard used by CPD personnel\nlists \"all subjects with an SSL score of one or higher are shown and placed in\ndescending order of score.\" If all scores are taken into consideration and viewed\nby CPD, then there is value in looking at patterns across all individuals on the\nlist rather than just individuals with the highest scores, especially when the\ncutoffs/totals aren't made clear.\n\n## Total Numbers on the List\n\nIn total, at the time this model was run for (July 31, 2016, for the period from\nAugust 1, 2012 through July 31, 2016), there were 398,684 individuals in the records\nof arrest data used to produce this list. There is no clear indication of how many individuals\nCPD considers to be \"on the list\", but over time numbers ranging from 426 ([in the initial iteration evaluated by RAND](https://link.springer.com/article/10.1007/s11292-016-9272-0)) to\nto 1,400 ([in a May 2016 New York Times Story](https://link.springer.com/article/10.1007/s11292-016-9272-0)),\nwith one source referring to 30,000 individuals being included ([September 2015 Chicago Sun-Times story](http://chicago.suntimes.com/news/four-of-eight-men-slain-wednesday-on-police-at-risk-list/)).\n\n## List Cutoffs\n\nIn stories describing the SSL, multiple cutoffs have been mentioned for individuals to be considered \"on the list\",\nor to be on the list and given additional scrutiny. The RAND evaluation (linked above) gave the impression that\nthe scores are created and then a semi-manual selection process happens, which resulted in 426 individuals.\n\nHowever, other stories have often referred to scores of 400 and above as being subject to higher levels of\nscrutiny, but often aren't explicit about whether they are an actual cutoff for being on the SSL or not. A\n[May 2016 Chicago Tribune editorial](http://www.chicagotribune.com/news/opinion/editorials/ct-gangs-police-loury-algorithm-edit-md-20160510-story.html)\nputs the cutoff for inclusion at the \"upper 200s or higher\", which at the time Chicago police Superintendent Eddie Johnson\ndescribed as only being made up of 1,300 people. This cutoff of the upper 200s is also mentioned in a\n[December 2016 LA Times story](http://www.latimes.com/nation/la-na-chicago-shootings-20161226-story.html). However,\nlooking at the released data, 287,404 (72.09%) of the 398,684 individuals had score of 250 or above.\n\n## Counts by Score\n\n| Score  | Count Individuals |\n|--------|-------------------|\n| \u003e 0    | 398,684           |\n| \u003e= 100 | 397,917           |\n| \u003e= 150 | 391,046           |\n| \u003e= 200 | 354,994           |\n| \u003e= 250 | 287,404           |\n| \u003e= 300 | 173,001           |\n| \u003e= 350 | 29,212            |\n| \u003e= 400 | 3,721             |\n| \u003e= 450 | 709               |\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpjsier%2Fstrategic-subject-list","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fpjsier%2Fstrategic-subject-list","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpjsier%2Fstrategic-subject-list/lists"}