Base Difficulty

Base difficulty: Level 1050 edit

Level distribution for noun (unit_of_measurement): 224: 12 1050: 1 1090: 8 1399: 3

Per-Language Difficulty Overrides

No difficulty overrides set. The base difficulty level will be used for all languages.

Add Difficulty Override
-1 to exclude, 1-1399 for level
Frequency and Tier Signals
Combined Frequency Rank: 6674 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cefr B2 (4 of 6) 6900

Rank used = synthetic rank this tier contributes to the combined frequency rank (lower = more common).

Corpus Frequency
Corpus Freq (per M) Best form Share Zipf rank Forms
19th_books 4.42 7110 50% 14220 downrated 1
20th_books 0.00 — — — 0
wiki_math 0.00 — — — 0
wiki_geography 44.45 1604 50% 3208 downrated 1
wiki_biology 30.13 2277 50% 4554 downrated 1
wiki_modern_life 32.85 2266 50% 4532 downrated 1
wiki_arts 0.00 — — — 0
wiki_society 0.00 — — — 0
wiki_linguistics 0.00 — — — 0
wiki_physical_science 55.85 2084 50% 2492 downrated 2
wiki_history 0.00 — — — 0
early_modern_science 29.24 1963 50% 3926 downrated 1
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 3.44 8486 50% 16972 downrated 1
eu_parliament_debates 0.00 — — — 0
openstax_science 0.00 — — — 0
openstax_society 11.78 4694 50% 9388 downrated 1
wpa_life_histories 33.72 1711 50% 2652 downrated 2

Best form = the single best-ranked form in the corpus, share-blind — how the spelling itself ranked. Share = how much of that spelling belongs to this lemma, when several senses compete for it. Zipf rank = all the forms combined (variant spellings included), each scaled by its share, and what feeds the combined frequency rank. Combining forms improves on the best form, but a share below 100% pushes the other way and usually wins: a sense holding a small slice of a common spelling is a rare word, so its rank lands downrated below the best form — and once it falls past what the corpus can support it is capped at the rank an unlisted word would get.