Base Difficulty

Base difficulty: Level 1399 edit

Level distribution for noun (activity): 20: 1 29: 14 260: 16 264: 28 266: 29 278: 1 330: 2 360: 1 380: 1 405: 2 406: 1 410: 1 416: 1 1000: 8 1010: 3 1020: 2 1030: 1 1040: 11 1050: 2 1060: 6 1070: 5 1078: 2 1090: 1 1120: 5 1205: 1 1208: 2 1211: 1 1212: 1 1214: 3 1215: 2 1216: 1 1217: 2 1218: 1 1219: 1 1220: 1 1221: 3 1222: 3 1223: 1 1224: 3 1225: 9 1226: 1 1399: 74

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: 9315 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cefr B1 (3 of 6) 4200

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 0.72 7596 9% 20000 capped 1
20th_books 0.76 7055 9% 20000 capped 1
wiki_math 14.13 874 9% 8000 capped 1
wiki_geography 3.61 3423 9% 9000 capped 1
wiki_biology 5.96 2080 9% 9000 capped 1
wiki_modern_life 6.74 1996 9% 10000 capped 1
wiki_arts 31.42 600 9% 4109 downrated 2
wiki_society 3.04 4041 9% 11000 capped 1
wiki_linguistics 3.35 2979 9% 9000 capped 1
wiki_physical_science 26.89 521 9% 5063 downrated 2
wiki_history 12.42 1817 9% 9000 capped 2
early_modern_science 7.80 1346 9% 10400 capped 1
religious_translated 3.46 2449 9% 10400 capped 1
cooking 6.14 1462 9% 5200 capped 1
legal_scotus 2.74 3445 9% 20000 capped 1
eu_parliament_debates 1.65 3961 9% 11000 capped 1
openstax_science 12.31 1045 9% 11000 capped 1
openstax_society 1.91 5018 9% 11000 capped 1
wpa_life_histories 0.00 — — — 0

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.