Base Difficulty

Base difficulty: Level 274 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: 165 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
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 316.34 379 100% 316 2
20th_books 283.33 453 100% 360 2
wiki_math 1952.91 77 100% 61 2
wiki_geography 159.57 1763 100% 886 2
wiki_biology 475.54 514 100% 267 2
wiki_modern_life 626.47 286 100% 175 2
wiki_arts 338.63 540 100% 377 2
wiki_society 763.29 248 100% 140 2
wiki_linguistics 1571.42 109 100% 73 2
wiki_physical_science 738.22 242 100% 171 2
wiki_history 253.06 722 100% 515 2
early_modern_science 1043.00 149 100% 99 2
religious_translated 180.40 767 100% 580 2
cooking 309.88 657 100% 405 2
legal_scotus 3799.78 36 100% 25 2
eu_parliament_debates 988.15 175 100% 128 2
openstax_science 766.78 238 100% 150 2
openstax_society 761.83 243 100% 159 2
wpa_life_histories 180.16 727 100% 561 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.