Base Difficulty

Base difficulty: Level 14 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: 404 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
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 246.72 416 100% 416 1
20th_books 253.88 405 100% 405 1
wiki_math 855.77 147 100% 147 1
wiki_geography 358.75 330 100% 330 1
wiki_biology 281.43 434 100% 434 1
wiki_modern_life 336.85 317 100% 317 1
wiki_arts 273.88 415 100% 415 1
wiki_society 187.64 680 100% 680 1
wiki_linguistics 385.87 315 100% 315 1
wiki_physical_science 686.26 141 100% 141 1
wiki_history 106.93 1243 100% 1243 1
early_modern_science 591.17 173 100% 173 1
religious_translated 548.56 227 100% 227 1
cooking 321.15 468 100% 468 1
legal_scotus 167.37 784 100% 784 1
eu_parliament_debates 232.77 529 100% 529 1
openstax_science 396.48 308 100% 308 1
openstax_society 228.18 611 100% 611 1
wpa_life_histories 164.92 652 100% 652 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.