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: 5 (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 Starters (1 of 3) 325
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 28393.18 4 100% 4 1
20th_books 27952.13 3 100% 3 1
wiki_math 21181.20 7 100% 7 1
wiki_geography 22319.91 5 100% 5 1
wiki_biology 25773.76 5 100% 5 1
wiki_modern_life 28361.27 6 100% 6 1
wiki_arts 24668.56 6 100% 6 1
wiki_society 28346.17 5 100% 5 1
wiki_linguistics 22020.91 6 100% 6 1
wiki_physical_science 24417.76 6 100% 6 1
wiki_history 29597.80 5 100% 5 1
early_modern_science 26913.72 4 100% 4 1
religious_translated 27114.56 4 100% 4 1
cooking 20108.89 6 100% 6 1
legal_scotus 33255.52 3 100% 3 1
eu_parliament_debates 36511.58 3 100% 3 1
openstax_science 26637.57 5 100% 5 1
openstax_society 32060.92 4 100% 4 1
wpa_life_histories 30388.67 3 100% 3 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.