Base Difficulty

Base difficulty: Level 10 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: 97 (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 1485.51 81 99% 82 downrated 1
20th_books 1698.58 73 99% 74 downrated 1
wiki_math 1186.41 98 99% 99 downrated 1
wiki_geography 1643.06 47 99% 47 1
wiki_biology 987.34 96 99% 97 downrated 1
wiki_modern_life 1306.04 63 99% 63 1
wiki_arts 1016.85 84 99% 85 downrated 1
wiki_society 1069.53 76 99% 77 downrated 1
wiki_linguistics 625.17 186 99% 187 downrated 1
wiki_physical_science 1063.58 80 99% 81 downrated 1
wiki_history 1277.31 68 99% 69 downrated 1
early_modern_science 973.05 111 99% 112 downrated 1
religious_translated 945.25 138 99% 139 downrated 1
cooking 3504.08 37 99% 37 1
legal_scotus 763.34 133 99% 134 downrated 1
eu_parliament_debates 704.41 177 99% 178 downrated 1
openstax_science 726.83 130 99% 131 downrated 1
openstax_society 1520.94 66 99% 66 1
wpa_life_histories 2067.28 62 99% 62 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.