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: 234 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cambridge_yle Flyers (3 of 3) 1200
cefr A2 (2 of 6) 2100

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 902.61 137 100% 137 1
20th_books 781.20 167 100% 167 1
wiki_math 429.62 330 100% 330 1
wiki_geography 199.18 637 100% 637 1
wiki_biology 378.49 301 100% 301 1
wiki_modern_life 602.64 156 100% 156 1
wiki_arts 393.80 263 100% 263 1
wiki_society 553.90 167 100% 167 1
wiki_linguistics 468.63 258 100% 258 1
wiki_physical_science 387.81 334 100% 334 1
wiki_history 423.89 240 100% 240 1
early_modern_science 917.70 116 100% 116 1
religious_translated 1138.36 113 100% 113 1
cooking 689.62 237 100% 237 1
legal_scotus 919.23 116 100% 116 1
eu_parliament_debates 635.11 198 100% 198 1
openstax_science 429.31 271 100% 271 1
openstax_society 517.95 220 100% 220 1
wpa_life_histories 407.15 293 100% 293 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.