Base Difficulty

Base difficulty: Level 1399 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: 1069 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cefr B2 (4 of 6) 6900

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 0.00 — — — 0
20th_books 5.61 7074 67% 10611 downrated 1
wiki_math 323.54 589 67% 424 2
wiki_geography 77.87 2237 80% 1788 2
wiki_biology 183.36 886 80% 751 2
wiki_modern_life 229.02 749 80% 603 2
wiki_arts 57.65 2958 80% 2330 2
wiki_society 236.62 608 80% 549 2
wiki_linguistics 102.58 1269 80% 1206 2
wiki_physical_science 327.82 592 80% 431 2
wiki_history 56.71 3356 80% 2346 2
early_modern_science 0.00 — — — 0
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 343.71 461 80% 367 2
eu_parliament_debates 100.16 1574 67% 1108 2
openstax_science 414.56 360 80% 313 2
openstax_society 349.18 345 80% 359 downrated 2
wpa_life_histories 6.71 5992 67% 8988 downrated 1

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.