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: 913 (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 Starters (1 of 3) 325
cefr C1 (5 of 6) 12000

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 312.15 280 80% 350 downrated 1
20th_books 375.08 248 80% 310 downrated 1
wiki_math 25.87 2685 80% 3356 downrated 1
wiki_geography 82.83 1336 80% 1670 downrated 1
wiki_biology 112.57 997 80% 1246 downrated 1
wiki_modern_life 119.37 932 80% 1165 downrated 1
wiki_arts 121.05 869 80% 1086 downrated 1
wiki_society 76.40 1490 80% 1863 downrated 1
wiki_linguistics 49.44 2032 80% 2540 downrated 1
wiki_physical_science 77.91 1491 80% 1864 downrated 1
wiki_history 116.90 896 80% 1120 downrated 1
early_modern_science 121.80 732 80% 915 downrated 1
religious_translated 129.61 662 80% 828 downrated 1
cooking 0.00 — — — 0
legal_scotus 43.88 2156 80% 2695 downrated 1
eu_parliament_debates 112.62 843 80% 1054 downrated 1
openstax_science 69.82 1582 80% 1977 downrated 1
openstax_society 98.88 1153 80% 1441 downrated 1
wpa_life_histories 150.40 571 80% 714 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.