Base Difficulty

Base difficulty: Level 14 edit

Level distribution for adverb (adverb_other): 6: 1 14: 2 17: 1 23: 1 105: 1 1130: 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: 1737 (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 89.14 1055 100% 1055 1
20th_books 102.44 964 100% 964 1
wiki_math 90.08 1351 100% 1351 1
wiki_geography 60.48 2323 100% 2323 1
wiki_biology 52.68 2585 100% 2585 1
wiki_modern_life 68.70 2169 100% 2169 1
wiki_arts 50.55 2752 100% 2752 1
wiki_society 33.60 4037 100% 4037 1
wiki_linguistics 22.57 4209 100% 4209 1
wiki_physical_science 58.23 2405 100% 2405 1
wiki_history 70.93 1943 100% 1943 1
early_modern_science 97.20 1204 100% 1204 1
religious_translated 45.68 2108 100% 2108 1
cooking 116.06 1025 100% 1025 1
legal_scotus 36.63 3027 100% 3027 1
eu_parliament_debates 24.65 3288 100% 3288 1
openstax_science 61.92 2149 100% 2149 1
openstax_society 40.51 3084 100% 3084 1
wpa_life_histories 71.93 1351 100% 1351 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.