The U.S. Census Bureau conducts field tests (for example, a planned 2026 Census Test) to develop and evaluate methods for obtaining complete and accurate population counts and demographic data.
January 01, 2026
high
procedural
Purpose and use of census field tests in preparing for the decennial census.
Rates of violent crime in the United States have been declining for decades, and in many U.S. cities, including Chicago, violent-crime levels are at or near record lows.
October 07, 2025
high
statistical
Long-term national trend in violent crime rates and city-level crime observations.
As of early October 2025, Chicago had nearly 1,200 shootings year-to-date in 2025, a decline of about 35% from 1,778 shootings reported for January–October 2024.
October 04, 2025
high
temporal
City-level shooting counts reported by Chicago authorities, comparing a year-to-date total in 2025 with the same period in 2024.
As of early October 2025, overall crime in Chicago was approximately 35% higher compared with 2021.
October 04, 2025
high
temporal
Year-to-date comparison of total crime levels in Chicago relative to 2021.
Open Doors International's 2025 World Watch List reports that of 4,476 Christians reported killed worldwide in its reporting period, 3,100 (69%) of those deaths were in Nigeria.
January 01, 2025
high
statistical
Fatality figures for Christians reported by Open Doors International in its 2025 World Watch List reporting period.
The Baltimore Police Department reported that by year-end 2024 homicides fell 23%, with 201 homicides in 2024 compared with 261 homicides in 2023, and non-fatal shootings fell 34%, with 414 non-fatal shootings in 2024 compared with 635 in 2023.
December 31, 2024
high
statistical
Year-over-year crime statistics reported by the municipal police department.
The Anti-Defamation League reported 860 antisemitic acts at non-Jewish K-12 schools in the United States in 2024, a 26% decrease from 2023 but higher than the 494 acts reported in 2022.
December 31, 2024
high
temporal
Nationwide tracking of antisemitic incidents at K-12 schools by the Anti-Defamation League.
Large publicly available public-health data sets tend to contain a very large number of variables, enabling many different analytical comparisons and increasing the risk of identifying chance correlations (false-positive findings) through data dredging or p-hacking.
high
descriptive
High-dimensional public-health data sets offer many opportunities for exploratory analyses, which can produce spurious associations if not properly controlled or validated.