Base Difficulty

Base difficulty: Level 25 edit

Level distribution for verb (physical_action): 5: 8 7: 3 8: 4 10: 5 11: 1 12: 1 19: 1 22: 1 23: 1 24: 2 25: 5 27: 3 28: 2 29: 4 109: 2 135: 1 140: 3 160: 3 165: 1 170: 1 172: 1 179: 2 185: 1 190: 2 194: 1 196: 1 204: 5 205: 3 215: 1 235: 1 254: 1 278: 4 279: 4 299: 1 300: 1 309: 2 311: 1 314: 2 319: 41 330: 3 340: 1 370: 1 400: 1 405: 4 406: 3 410: 2 415: 8 455: 1 475: 9 485: 1 1020: 1 1040: 3 1070: 3 1078: 10 1090: 12 1110: 1 1120: 2 1201: 1 1205: 1 1210: 1 1221: 1 1399: 72

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: 1454 (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 208.92 298 10% 454 downrated 5
20th_books 188.93 302 10% 512 downrated 5
wiki_math 104.86 1178 50% 1079 4
wiki_geography 211.19 436 50% 601 downrated 4
wiki_biology 69.96 1014 10% 1956 downrated 3
wiki_modern_life 2.71 4895 10% 10000 capped 1
wiki_arts 22.07 3494 50% 6085 downrated 2
wiki_society 55.57 2668 10% 2423 4
wiki_linguistics 0.00 — — — 0
wiki_physical_science 65.89 2012 50% 2164 downrated 2
wiki_history 5.93 2306 10% 9000 capped 1
early_modern_science 149.75 979 10% 780 4
religious_translated 187.35 423 10% 570 downrated 4
cooking 62.31 322 10% 1961 downrated 2
legal_scotus 44.18 2731 50% 2322 4
eu_parliament_debates 51.37 1683 50% 1968 downrated 3
openstax_science 54.65 2019 50% 2338 downrated 3
openstax_society 36.05 2778 10% 3318 downrated 3
wpa_life_histories 162.84 564 50% 605 downrated 5

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.