Base Difficulty

Base difficulty: Level 276 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: 556 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 23.23 3364 95% 3532 downrated 1
20th_books 18.43 3937 95% 4134 downrated 1
wiki_math 201.81 700 95% 621 2
wiki_geography 461.00 427 95% 271 2
wiki_biology 866.00 132 95% 120 2
wiki_modern_life 525.67 189 95% 185 2
wiki_arts 241.89 465 95% 488 downrated 1
wiki_society 177.69 688 95% 722 downrated 1
wiki_linguistics 166.27 883 95% 754 2
wiki_physical_science 562.78 245 95% 222 2
wiki_history 85.50 1493 95% 1568 downrated 1
early_modern_science 203.13 664 95% 544 2
religious_translated 0.00 — — — 0
cooking 196.34 639 95% 671 downrated 1
legal_scotus 146.64 912 95% 841 2
eu_parliament_debates 75.74 1443 95% 1515 downrated 1
openstax_science 389.23 339 95% 320 2
openstax_society 153.79 881 95% 925 downrated 1
wpa_life_histories 228.77 477 95% 466 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.