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: 493 (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 169.31 1075 100% 555 2
20th_books 108.75 1501 100% 830 2
wiki_math 508.15 490 100% 268 2
wiki_geography 194.58 818 100% 685 2
wiki_biology 461.11 319 100% 259 2
wiki_modern_life 317.74 459 100% 386 2
wiki_arts 119.59 2065 100% 1160 2
wiki_society 285.79 626 100% 457 2
wiki_linguistics 67.18 2718 100% 1607 2
wiki_physical_science 627.02 207 100% 184 2
wiki_history 185.47 1149 100% 718 2
early_modern_science 473.09 422 100% 228 2
religious_translated 117.30 1391 100% 851 2
cooking 82.26 1823 100% 998 2
legal_scotus 417.72 515 100% 305 2
eu_parliament_debates 435.91 318 100% 276 2
openstax_science 585.58 329 100% 222 2
openstax_society 345.16 550 100% 397 2
wpa_life_histories 113.16 1558 100% 846 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.