A county-level regression model accounted for differences over time.

Source: https://www.latimes.com/california/story/2023-12-14/arming-america-how-we-did-the-analysis-gun-dealers

Born in 1955 in Anhui Province to a father who was a county-level government official, he rose through the ranks after serving as a party leader for Henan Province and Liaoning Province.

Source: https://www.forbes.com/sites/robertolsen/2023/10/26/chinas-former-premier-li-keqiang-dies-at-68-from-heart-attack/

The authors of the longitudinal cohort study wanted to determine whether there is an association between the number of Black county-level primary care physicians and the number of mortality-related outcomes.

Source: https://www.denver7.com/a-single-black-doctor-can-increase-life-expectancy-for-black-patients

The Northeast Mississippi Daily Journal, The Marshall Project and ProPublica asked the court administrators in all 23 circuit court districts, as well as the county-level clerks in all 82 counties, if they have a written plan for indigent defense.

Source: https://www.propublica.org/article/mississippi-courts-wont-say-how-they-provide-lawyers-for-poor-clients