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: 896 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
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 299.59 425 100% 336 2
20th_books 213.91 584 100% 470 2
wiki_math 95.86 1286 100% 1286 1
wiki_geography 0.00 — — — 0
wiki_biology 57.73 2369 100% 2369 1
wiki_modern_life 76.00 1951 100% 1951 1
wiki_arts 98.45 1411 100% 1411 1
wiki_society 120.97 1537 100% 1152 2
wiki_linguistics 90.29 1431 100% 1431 1
wiki_physical_science 68.02 2110 100% 2110 1
wiki_history 63.17 2162 100% 2162 1
early_modern_science 486.00 223 100% 212 2
religious_translated 233.44 509 100% 447 2
cooking 206.21 637 100% 637 1
legal_scotus 219.39 575 100% 575 1
eu_parliament_debates 105.50 1133 100% 1133 1
openstax_science 79.80 1726 100% 1726 1
openstax_society 67.38 2049 100% 2049 1
wpa_life_histories 83.13 1511 100% 1104 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.