Base Difficulty

Base difficulty: Level 20 edit

Level distribution for noun (quantitative_concept): 20: 1 26: 1 162: 20 276: 22 380: 20 390: 1 456: 1 460: 1 1000: 1 1050: 2 1070: 2 1080: 5 1090: 1 1110: 1 1120: 1 1202: 2 1203: 1 1204: 2 1206: 1 1210: 2 1211: 1 1213: 7 1218: 1 1225: 2 1226: 1 1399: 21

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: 516 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 49.71 1812 100% 1812 1
20th_books 42.69 2028 100% 2028 1
wiki_math 439.93 373 100% 310 2
wiki_geography 157.93 844 100% 844 1
wiki_biology 915.39 117 100% 109 2
wiki_modern_life 560.29 225 100% 187 2
wiki_arts 231.72 720 100% 564 2
wiki_society 117.29 1180 100% 1180 1
wiki_linguistics 67.80 1881 100% 1881 1
wiki_physical_science 560.69 250 100% 222 2
wiki_history 102.87 1300 100% 1300 1
early_modern_science 305.12 394 100% 353 2
religious_translated 44.48 2141 100% 2141 1
cooking 524.97 312 100% 276 2
legal_scotus 29.94 3471 100% 3471 1
eu_parliament_debates 45.13 2228 100% 2228 1
openstax_science 549.07 225 100% 202 2
openstax_society 184.20 772 100% 772 1
wpa_life_histories 66.34 1607 100% 1305 2

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.