Base Difficulty

Base difficulty: Level 17 edit

Level distribution for adverb (adverb_other): 6: 1 14: 2 17: 1 23: 1 105: 1 1130: 1

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: 539 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 206.98 326 33% 508 downrated 2
20th_books 160.07 399 33% 656 downrated 2
wiki_math 278.71 340 33% 515 downrated 2
wiki_geography 206.52 365 33% 579 downrated 2
wiki_biology 351.54 166 33% 295 downrated 2
wiki_modern_life 350.80 119 33% 267 downrated 2
wiki_arts 182.59 320 33% 617 downrated 2
wiki_society 222.60 272 33% 489 downrated 2
wiki_linguistics 233.06 284 33% 537 downrated 2
wiki_physical_science 372.83 119 33% 276 downrated 2
wiki_history 155.09 462 33% 755 downrated 2
early_modern_science 402.85 124 33% 255 downrated 2
religious_translated 85.49 716 33% 1250 downrated 2
cooking 130.71 521 33% 1023 downrated 2
legal_scotus 297.37 239 33% 387 downrated 2
eu_parliament_debates 221.44 333 33% 553 downrated 2
openstax_science 262.94 169 33% 414 downrated 2
openstax_society 329.87 145 33% 337 downrated 2
wpa_life_histories 97.25 672 33% 1085 downrated 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.