Base Difficulty

Base difficulty: Level 415 edit

Level distribution for verb (possession): 3: 3 7: 2 10: 1 20: 3 175: 14 254: 1 309: 1 314: 1 360: 1 406: 1 415: 3 455: 1 475: 3 1070: 1 1205: 1 1399: 28

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: 4912 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cefr A2 (2 of 6) 2100

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 20.86 1076 11% 4295 downrated 4
20th_books 15.87 1321 11% 5522 downrated 4
wiki_math 2.18 3680 11% 8000 capped 1
wiki_geography 24.72 1807 10% 5641 downrated 4
wiki_biology 3.01 4348 11% 9000 capped 1
wiki_modern_life 31.14 1165 10% 4675 downrated 4
wiki_arts 29.07 1475 11% 4770 downrated 4
wiki_society 41.91 1113 10% 3327 downrated 4
wiki_linguistics 7.69 2553 10% 9000 capped 2
wiki_physical_science 0.00 — — — 0
wiki_history 30.61 794 11% 4310 downrated 3
early_modern_science 14.73 1992 10% 7492 downrated 3
religious_translated 54.33 558 11% 1996 downrated 3
cooking 0.00 — — — 0
legal_scotus 29.38 1264 11% 4274 downrated 4
eu_parliament_debates 29.59 896 10% 3723 downrated 4
openstax_science 11.66 2376 10% 10378 downrated 3
openstax_society 40.50 933 10% 3444 downrated 4
wpa_life_histories 14.60 1233 11% 6105 downrated 4

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.