Adults and households are different statistical units

Degree attainment uses residents age 25 and older. Median household income uses households, which may include several adults, children and multiple earners. These are not linked records of the same people. A state-level comparison therefore cannot say how much a particular graduate earns, whether the graduate’s household has multiple earners, or which member’s credential explains household income.

Bachelor’s-or-higher includes postgraduate degrees

The source numerator combines bachelor’s, master’s, professional and doctoral degrees. It does not count only bachelor’s holders without further qualifications. Adult residents may have completed their education elsewhere. A state with a high attainment share is not necessarily the state where those degrees were awarded, so this measure cannot serve as a ranking of local colleges.

Nearby income estimates require uncertainty

Maryland’s household income median is $103,678 and New Jersey’s is $103,556. Massachusetts, Maryland and New Jersey have close point estimates in this collection. The direct income indicator retains the producer’s 90% margins of error. Their sorted positions should not be presented as conclusive statistical differences without an appropriate comparison test.