Base Difficulty

Base difficulty: Level 221 edit

Level distribution for noun (concept_idea): 19: 2 26: 1 27: 1 221: 28 270: 30 274: 30 275: 28 280: 25 300: 1 360: 1 380: 2 1000: 1 1030: 1 1060: 5 1070: 6 1110: 4 1120: 4 1399: 66

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: 355 (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 273.75 450 100% 367 2
20th_books 375.46 335 100% 278 2
wiki_math 520.85 297 100% 257 2
wiki_geography 86.44 1646 100% 1646 1
wiki_biology 152.62 893 100% 893 1
wiki_modern_life 112.71 1304 100% 1304 1
wiki_arts 219.70 671 100% 587 2
wiki_society 348.57 441 100% 345 2
wiki_linguistics 250.44 531 100% 531 1
wiki_physical_science 198.80 724 100% 724 1
wiki_history 236.76 600 100% 524 2
early_modern_science 849.36 184 100% 125 2
religious_translated 85.75 1199 100% 1199 1
cooking 178.04 723 100% 723 1
legal_scotus 1428.03 103 100% 75 2
eu_parliament_debates 1049.34 111 100% 105 2
openstax_science 300.48 424 100% 424 1
openstax_society 369.14 415 100% 350 2
wpa_life_histories 189.34 621 100% 543 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.