Base Difficulty

Base difficulty: Level 224 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: 1101 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cefr B1 (3 of 6) 4200

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 236.96 627 100% 410 2
20th_books 172.48 773 100% 558 2
wiki_math 0.00 — — — 0
wiki_geography 106.98 1832 100% 1292 2
wiki_biology 0.00 — — — 0
wiki_modern_life 72.57 3215 100% 1928 2
wiki_arts 0.00 — — — 0
wiki_society 0.00 — — — 0
wiki_linguistics 0.00 — — — 0
wiki_physical_science 122.74 2044 100% 1152 2
wiki_history 41.08 3257 100% 3257 1
early_modern_science 673.94 175 100% 155 2
religious_translated 20.71 3945 100% 3945 1
cooking 0.00 — — — 0
legal_scotus 26.71 4455 100% 2982 2
eu_parliament_debates 0.00 — — — 0
openstax_science 38.65 3160 100% 3160 1
openstax_society 63.24 2160 100% 2160 1
wpa_life_histories 641.98 236 100% 183 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.