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: 388 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cambridge_yle Flyers (3 of 3) 1200
cefr A1 (1 of 6) 800

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 1073.08 120 100% 120 1
20th_books 1158.01 113 100% 113 1
wiki_math 61.04 1761 100% 1761 1
wiki_geography 146.53 916 100% 916 1
wiki_biology 188.38 718 100% 718 1
wiki_modern_life 192.61 676 100% 676 1
wiki_arts 211.43 594 100% 594 1
wiki_society 158.79 833 100% 833 1
wiki_linguistics 72.61 1754 100% 1754 1
wiki_physical_science 266.35 518 100% 518 1
wiki_history 192.29 657 100% 657 1
early_modern_science 438.33 243 100% 243 1
religious_translated 960.11 135 100% 135 1
cooking 263.61 529 100% 529 1
legal_scotus 75.06 1708 100% 1708 1
eu_parliament_debates 138.46 855 100% 855 1
openstax_science 376.29 332 100% 332 1
openstax_society 220.54 635 100% 635 1
wpa_life_histories 770.28 162 100% 162 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.