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: 338 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cambridge_yle Starters (1 of 3) 325
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 197.27 614 80% 494 2
20th_books 203.78 575 80% 497 2
wiki_math 1424.66 87 80% 86 2
wiki_geography 499.72 275 80% 230 2
wiki_biology 208.69 795 80% 658 2
wiki_modern_life 654.89 173 80% 155 2
wiki_arts 488.69 353 80% 224 2
wiki_society 202.18 822 80% 670 2
wiki_linguistics 218.84 706 80% 596 2
wiki_physical_science 471.70 441 80% 286 2
wiki_history 278.95 553 80% 447 2
early_modern_science 508.47 297 80% 212 2
religious_translated 143.70 961 80% 720 2
cooking 134.32 754 80% 943 downrated 1
legal_scotus 326.41 348 80% 369 downrated 2
eu_parliament_debates 244.52 543 80% 494 2
openstax_science 506.37 354 80% 254 2
openstax_society 281.42 619 80% 500 2
wpa_life_histories 288.25 388 80% 378 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.