Base Difficulty

Base difficulty: Level 9 edit

Level distribution for conjunction (conjunction_other): 6: 4 9: 4 10: 1 11: 2 304: 4 1399: 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: 71 (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 3252.94 44 100% 44 1
20th_books 3227.02 44 100% 44 1
wiki_math 5273.20 21 100% 21 1
wiki_geography 183.89 700 100% 700 1
wiki_biology 725.94 137 100% 137 1
wiki_modern_life 1118.54 76 100% 76 1
wiki_arts 557.01 180 100% 180 1
wiki_society 1072.60 77 100% 77 1
wiki_linguistics 956.61 115 100% 115 1
wiki_physical_science 1263.08 70 100% 70 1
wiki_history 530.32 175 100% 175 1
early_modern_science 3018.88 39 100% 39 1
religious_translated 2710.49 51 100% 51 1
cooking 2714.54 53 100% 53 1
legal_scotus 2465.86 37 100% 37 1
eu_parliament_debates 2145.86 56 100% 56 1
openstax_science 1998.20 46 100% 46 1
openstax_society 1887.02 55 100% 55 1
wpa_life_histories 2431.23 56 100% 56 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.