Base Difficulty

Base difficulty: Level 175 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: 423 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
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 551.12 120 50% 229 downrated 2
20th_books 480.63 147 50% 260 downrated 3
wiki_math 85.46 797 50% 1594 downrated 1
wiki_geography 258.34 443 50% 500 downrated 2
wiki_biology 143.24 424 50% 848 downrated 1
wiki_modern_life 245.39 280 50% 456 downrated 2
wiki_arts 377.45 152 50% 270 downrated 2
wiki_society 434.61 144 50% 235 downrated 3
wiki_linguistics 185.68 334 50% 668 downrated 1
wiki_physical_science 93.50 770 50% 1540 downrated 1
wiki_history 462.83 122 50% 214 downrated 2
early_modern_science 310.39 162 50% 324 downrated 1
religious_translated 496.98 127 50% 254 downrated 1
cooking 90.15 715 50% 1430 downrated 1
legal_scotus 380.48 172 50% 270 downrated 4
eu_parliament_debates 333.60 187 50% 374 downrated 1
openstax_science 139.64 480 50% 960 downrated 1
openstax_society 488.60 123 50% 218 downrated 2
wpa_life_histories 558.51 201 50% 196 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.