Finch and Crimmins argued that these groups exhibit “morbidity phenotypes” based on Swedish data from a Berkeley database. Norman Ryder proposed that these groups undergo “metabolism” and cause structural change. A 1997 typology sorts these groups into the archetypes of Prophet, Nomad, Hero, and Artist. Cross-sequential designs distinguish secular trends from effects named for these groups, which are controlled in typical prospective longitudinal studies and were possibly statistically isolated by Jean Twenge (“jeen TWENG-gay”). In The Fourth Turning, Strauss and Howe proposed a cycle of these groups, which name actuarial tables that do not assume them to be overlapping, as static life tables do. For 10 points, Margaret Mead analyzed “gaps” between what populations that successively retain the same size at replacement-level fertility? ■END■
ANSWER: generations [accept birth cohorts, age cohorts, graduation cohorts, or generational cohorts; accept generation gaps; accept overlapping generations; prompt on populations until read; prompt on specific generations like millennials or Baby Boomers by asking “what type of group is that?”] (The first line refers to the Human Mortality Database.)
<Social Science>
= Average correct buzz position