Base Difficulty

Base difficulty: Level 221 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: 427 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cambridge_yle Movers (2 of 3) 750
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 398.89 320 100% 259 2
20th_books 432.67 297 100% 251 2
wiki_math 101.63 1461 100% 1025 2
wiki_geography 67.21 3971 100% 2005 2
wiki_biology 134.94 1040 100% 1040 1
wiki_modern_life 88.88 1657 100% 1657 1
wiki_arts 110.67 1923 100% 1238 2
wiki_society 272.88 721 100% 491 2
wiki_linguistics 97.81 1701 100% 1210 2
wiki_physical_science 644.34 160 100% 160 1
wiki_history 167.14 1296 100% 806 2
early_modern_science 596.87 199 100% 176 2
religious_translated 329.64 405 100% 328 2
cooking 114.94 1031 100% 1031 1
legal_scotus 696.81 197 100% 158 2
eu_parliament_debates 790.33 231 100% 158 2
openstax_science 423.08 276 100% 276 1
openstax_society 216.60 1046 100% 645 2
wpa_life_histories 196.07 613 100% 529 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.