Base Difficulty

Base difficulty: Level 470 edit

Level distribution for verb (development): 30: 1 165: 2 170: 1 179: 1 196: 1 249: 1 278: 1 299: 2 300: 1 329: 1 470: 7 475: 1 1399: 6

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: 878 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
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 114.06 1314 100% 765 3
20th_books 102.86 1415 100% 843 3
wiki_math 0.00 — — — 0
wiki_geography 30.07 4371 100% 4371 1
wiki_biology 110.41 1671 100% 1218 2
wiki_modern_life 165.53 1376 100% 865 3
wiki_arts 48.89 2822 100% 2822 1
wiki_society 68.09 3206 100% 1965 2
wiki_linguistics 21.50 4343 100% 4343 1
wiki_physical_science 96.64 1508 100% 1508 1
wiki_history 137.43 1857 100% 970 3
early_modern_science 120.36 1374 100% 886 3
religious_translated 202.86 774 100% 524 2
cooking 1141.48 262 100% 133 3
legal_scotus 72.05 2467 100% 1363 3
eu_parliament_debates 279.31 685 100% 405 3
openstax_science 93.09 2606 100% 1363 2
openstax_society 104.99 3137 100% 1149 3
wpa_life_histories 79.10 2054 100% 1061 3

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.