Base Difficulty

Base difficulty: Level 270 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: 745 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cefr B1 (3 of 6) 4200

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 45.10 2683 100% 1781 2
20th_books 40.39 2647 100% 1897 2
wiki_math 0.00 — — — 0
wiki_geography 252.26 898 100% 538 2
wiki_biology 52.32 2589 100% 2589 1
wiki_modern_life 82.87 3201 100% 1725 2
wiki_arts 98.45 2282 100% 1393 2
wiki_society 368.38 421 100% 325 2
wiki_linguistics 79.54 2428 100% 1417 2
wiki_physical_science 0.00 — — — 0
wiki_history 304.93 623 100% 418 2
early_modern_science 91.50 1615 100% 1188 2
religious_translated 84.59 1216 100% 1216 1
cooking 0.00 — — — 0
legal_scotus 831.60 136 100% 126 2
eu_parliament_debates 509.64 307 100% 237 2
openstax_science 0.00 — — — 0
openstax_society 327.80 457 100% 395 2
wpa_life_histories 29.13 4377 100% 2474 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.