Base Difficulty

Base difficulty: Level 420 edit

Level distribution for adjective (indefinite_quantity): 420: 5 1020: 1 1120: 5 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: 377 (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 86.24 1085 100% 1085 1
20th_books 52.80 1697 100% 1697 1
wiki_math 386.89 361 100% 361 1
wiki_geography 451.44 239 100% 239 1
wiki_biology 524.97 198 100% 198 1
wiki_modern_life 588.68 160 100% 160 1
wiki_arts 525.95 189 100% 189 1
wiki_society 663.54 142 100% 142 1
wiki_linguistics 589.01 201 100% 201 1
wiki_physical_science 494.49 247 100% 247 1
wiki_history 363.54 291 100% 291 1
early_modern_science 354.63 303 100% 303 1
religious_translated 177.31 613 100% 613 1
cooking 146.49 837 100% 837 1
legal_scotus 150.17 880 100% 880 1
eu_parliament_debates 349.75 349 100% 349 1
openstax_science 450.93 242 100% 242 1
openstax_society 339.37 366 100% 366 1
wpa_life_histories 94.78 1070 100% 1070 1

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.