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: 149 (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 Movers (2 of 3) 750
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 1529.22 79 100% 79 1
20th_books 1406.12 86 100% 86 1
wiki_math 255.23 530 100% 530 1
wiki_geography 531.31 198 100% 198 1
wiki_biology 589.20 175 100% 175 1
wiki_modern_life 723.72 123 100% 123 1
wiki_arts 732.76 128 100% 128 1
wiki_society 610.66 157 100% 157 1
wiki_linguistics 977.03 113 100% 113 1
wiki_physical_science 462.11 265 100% 265 1
wiki_history 950.66 91 100% 91 1
early_modern_science 1052.11 101 100% 101 1
religious_translated 1520.26 84 100% 84 1
cooking 1319.52 116 100% 116 1
legal_scotus 1092.68 99 100% 99 1
eu_parliament_debates 610.67 207 100% 207 1
openstax_science 511.19 206 100% 206 1
openstax_society 620.05 183 100% 183 1
wpa_life_histories 1119.49 126 100% 126 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.