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The top 10 neighbors for David Letterman spread across comedians, actors, journalists, and politicians — no single subcategory dominates, and the scores compress into a narrow band from 0.92 down to 0.87, the defining signature of a flat shape.
Similarity here measures how closely two entities' audiences resemble each other in composition. Lewis Black (0.92) and Jim Gaffigan (0.91) sit at the top, both Comedians — but they are followed immediately by Alan Alda (0.91) and Rob Lowe (0.88), both Actors, then Keith Law (0.88) and Brent Terhune (0.88), a Journalist and a Comedian respectively. Jerry Seinfeld (0.88) and Jason Alexander (0.88) add another Comedian and Actor pair, while Rex Chapman (0.88, Athlete) and Justin Amash (0.87, Politician) round out the ten. The subcategory tally across the top 10: four Comedians, four Actors, one Journalist, one Athlete, one Politician — no TV Personalities other than Letterman himself appear in the top 10. The audience shape is genuinely cross-kind, pulling roughly equally from comedy and acting, with no single subcategory accounting for more than four of the ten slots.
That breadth, compressed into a tight similarity range, suggests an audience that is not organized around a single type of entertainer but around a sensibility that cuts across several of them.
