Base Difficulty

Base difficulty: Level 275 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: 1672 (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 11.62 3151 44% 7113 downrated 1
20th_books 8.11 4088 44% 9229 downrated 1
wiki_math 287.51 225 44% 442 downrated 2
wiki_geography 114.15 579 44% 1121 downrated 2
wiki_biology 122.27 528 44% 1033 downrated 2
wiki_modern_life 105.56 512 44% 1156 downrated 1
wiki_arts 45.51 1335 44% 3014 downrated 1
wiki_society 30.16 2045 44% 4617 downrated 1
wiki_linguistics 52.14 1104 44% 2492 downrated 1
wiki_physical_science 192.58 388 44% 697 downrated 2
wiki_history 42.84 1370 44% 3093 downrated 1
early_modern_science 74.34 1048 44% 1552 downrated 2
religious_translated 11.49 3319 44% 7493 downrated 1
cooking 24.96 1641 44% 3705 downrated 1
legal_scotus 33.44 2223 44% 3276 downrated 2
eu_parliament_debates 41.23 1584 44% 2456 downrated 2
openstax_science 183.54 384 44% 701 downrated 2
openstax_society 38.82 2007 44% 3298 downrated 2
wpa_life_histories 13.00 2871 44% 6481 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.