Base Difficulty

Base difficulty: Level 6 edit

Level distribution for preposition (preposition_other): 6: 10 10: 7 11: 8 14: 1 18: 4 23: 2 226: 5 1080: 1 1120: 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: 15 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 7958.49 18 100% 18 1
20th_books 7751.00 18 100% 18 1
wiki_math 12154.00 9 100% 9 1
wiki_geography 7180.77 14 100% 14 1
wiki_biology 8150.24 13 100% 13 1
wiki_modern_life 11613.90 9 100% 9 1
wiki_arts 9108.33 12 100% 12 1
wiki_society 8997.79 10 100% 10 1
wiki_linguistics 9699.37 11 100% 11 1
wiki_physical_science 9211.53 12 100% 12 1
wiki_history 9382.30 13 100% 13 1
early_modern_science 6533.25 20 100% 20 1
religious_translated 9273.51 12 100% 12 1
cooking 8656.32 12 100% 12 1
legal_scotus 9896.24 9 100% 9 1
eu_parliament_debates 12556.21 10 100% 10 1
openstax_science 9242.51 11 100% 11 1
openstax_society 10312.24 10 100% 10 1
wpa_life_histories 9062.09 12 100% 12 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.