#rating deviation

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An esports broadcast production booth with a live battle-feed monitor beside a second monitor showing a rating-history chart mid-redraw and a scrolling ladder-standings board, an amber highlight on the chart's newest unfinished segment

A Showdown Ladder Rating Measures the Ladder, Not the Player

Pokémon Showdown's Glicko-1 rating deviation is formally a standard error of measurement. Psychometrics' own invariance standard asks whether a score travels once the test changes — and a competitive metagame never stops changing the test.

By Brecht Corbeel · September 18, 2026 · 15 min read

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