Base Difficulty

Base difficulty: Level 11 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: 209 (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 1038.56 65 50% 130 downrated 1
20th_books 1257.30 55 50% 110 downrated 1
wiki_math 244.26 279 50% 558 downrated 1
wiki_geography 245.85 214 50% 428 downrated 1
wiki_biology 821.01 54 50% 108 downrated 1
wiki_modern_life 441.62 98 50% 196 downrated 1
wiki_arts 488.78 89 50% 178 downrated 1
wiki_society 415.42 106 50% 212 downrated 1
wiki_linguistics 713.43 77 50% 154 downrated 1
wiki_physical_science 459.72 102 50% 204 downrated 1
wiki_history 284.61 166 50% 332 downrated 1
early_modern_science 765.45 77 50% 154 downrated 1
religious_translated 788.58 80 50% 160 downrated 1
cooking 366.78 224 50% 448 downrated 1
legal_scotus 246.91 224 50% 448 downrated 1
eu_parliament_debates 1210.88 41 50% 82 downrated 1
openstax_science 667.66 71 50% 142 downrated 1
openstax_society 738.48 69 50% 138 downrated 1
wpa_life_histories 1251.69 53 50% 106 downrated 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.