Base Difficulty

Base difficulty: Level 470 edit

Level distribution for verb (development): 30: 1 165: 2 170: 1 179: 1 196: 1 249: 1 278: 1 299: 2 300: 1 329: 1 470: 7 475: 1 1399: 6

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: 1888 (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 0.00 — — — 0
20th_books 0.00 — — — 0
wiki_math 18.48 3777 100% 3777 1
wiki_geography 42.23 3241 100% 3241 1
wiki_biology 381.37 298 100% 298 1
wiki_modern_life 99.40 1475 100% 1475 1
wiki_arts 93.16 1487 100% 1487 1
wiki_society 73.92 1903 100% 1903 1
wiki_linguistics 209.59 846 100% 587 3
wiki_physical_science 189.01 991 100% 753 2
wiki_history 34.92 3771 100% 3771 1
early_modern_science 69.86 1645 100% 1645 1
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 17.00 6756 100% 3779 2
eu_parliament_debates 0.00 — — — 0
openstax_science 253.10 849 100% 538 3
openstax_society 100.86 2341 100% 1202 3
wpa_life_histories 0.00 — — — 0

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.