Base Difficulty

Base difficulty: Level 6 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: 38 (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 Starters (1 of 3) 325
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 6994.43 23 100% 23 1
20th_books 6978.00 20 100% 20 1
wiki_math 2239.32 48 100% 48 1
wiki_geography 1802.46 42 100% 42 1
wiki_biology 3200.35 34 100% 34 1
wiki_modern_life 2494.49 39 100% 39 1
wiki_arts 2697.48 33 100% 33 1
wiki_society 2575.29 34 100% 34 1
wiki_linguistics 3457.23 33 100% 33 1
wiki_physical_science 2466.16 36 100% 36 1
wiki_history 3148.59 26 100% 26 1
early_modern_science 5989.54 24 100% 24 1
religious_translated 6107.95 23 100% 23 1
cooking 1881.81 84 100% 84 1
legal_scotus 3041.24 30 100% 30 1
eu_parliament_debates 3543.25 30 100% 30 1
openstax_science 2265.85 42 100% 42 1
openstax_society 2815.44 35 100% 35 1
wpa_life_histories 5777.58 22 100% 22 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.