RESEARCH NOTE

Bias Traps in Comparing Sumo Rank Tenure

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A miniature arrangement of three sets of conditions in separate notebooks.

Separate consecutive tenure, career-total tenure and tournaments actually competed at the rank. Do not mix a tournament spent ranked but absent, a return after demotion, an unfinished active career or different historical tournament frequencies into one ranking of strength.

Official banzuke rows can count tenure tournament by tournament. One headline number, however, erases the difference between holding a rank on paper and appearing on the dohyo while holding it.

Publish three clocks

Consecutive tenure runs until the rank is interrupted. Career-total tenure adds later returns. Competed tenure can count only tournaments in which the wrestler took at least one bout at that rank. These definitions produce different orders, so show them in separate columns.

Retain mid-tournament withdrawal, full absence, default-only tournament and a period in which no tournament was held as different states. An active wrestler’s tenure is still censored and should not appear beside completed careers without that marker.

Era and rules change the opportunity to accumulate

Annual tournament frequency, rank systems and demotion or return conditions differ across history. Tournament counts alone are not automatically comparable. If calendar years are shown as an additional scale, do not manufacture missing tournaments; keep official banzuke tournaments as the base unit.

Selecting only famous long tenures removes short paths. Start with everyone who reached the rank. Absence rate and win rate while ranked are separate outcomes. Long tenure does not mean “equally strong throughout,” and short tenure is not a synonym for failure.

Conditions needed beside the table

  • consecutive, career-total and competed-tenure definitions;
  • treatment of withdrawal, default, demotion, return and active censoring;
  • rules period, number of held tournaments and full eligible cohort;
  • banzuke version, retrieval date and tie handling.

One duration cannot carry an entire career story. Changes within the tenure need bout and scorecard evidence of their own.

Treat a ranking that collapses as a result

The research question is: how does the tenure distribution change across the three definitions for everyone who reached the rank within one rules period? The hypothesis to test is that at least some apparent leaders depend on whether ranked-but-absent tournaments count. Recalculate after including or excluding those tournaments, preserving non-held periods, and censoring active careers at a stated date. If the leaders change substantially, tenure is definition-sensitive rather than one immutable record.

Long tenure is not interchangeable with win rate, health or consistency; each needs its own denominator and evidence. When the next banzuke extends active careers, update cohort size and censoring date. If a definition change breaks comparability with the former release, start a separate series instead of quietly extending the line.

Find one tournament inside the long line

Choose a single basho from a long tenure and return to its banzuke and fifteen days. Watch one bout rather than the record line alone. Even in the middle of a record run there may be a new opponent, a comeback or a changed technical choice. A tenure table is less a monument than a layer of time waiting to be excavated again.

Sources

  • Japan Sumo Association banzuke, wrestler profiles and annual schedule (checked 3 September 2026).

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