Base Difficulty

Base difficulty: Level 23 edit

Level distribution for adverb (location): 18: 4 23: 22 250: 13 1070: 1 1120: 5 1205: 1 1221: 1 1399: 2

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: 323 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cambridge_yle Movers (2 of 3) 750
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 300.21 344 100% 344 1
20th_books 303.70 353 100% 353 1
wiki_math 643.77 201 100% 201 1
wiki_geography 219.64 579 100% 579 1
wiki_biology 802.93 120 100% 120 1
wiki_modern_life 703.30 128 100% 128 1
wiki_arts 519.42 193 100% 193 1
wiki_society 530.70 175 100% 175 1
wiki_linguistics 892.65 127 100% 127 1
wiki_physical_science 492.98 247 100% 247 1
wiki_history 205.24 600 100% 600 1
early_modern_science 436.81 244 100% 244 1
religious_translated 111.96 937 100% 937 1
cooking 198.27 659 100% 659 1
legal_scotus 100.56 1312 100% 1312 1
eu_parliament_debates 122.42 979 100% 979 1
openstax_science 282.43 465 100% 465 1
openstax_society 399.79 296 100% 296 1
wpa_life_histories 378.62 309 100% 309 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.