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: 459 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cambridge_yle Flyers (3 of 3) 1200
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 32.43 3313 100% 2326 2
20th_books 68.35 1767 100% 1235 2
wiki_math 1900.23 108 100% 64 2
wiki_geography 158.42 1491 100% 892 2
wiki_biology 170.11 1521 100% 817 2
wiki_modern_life 363.84 686 100% 367 2
wiki_arts 144.34 1709 100% 957 2
wiki_society 411.30 592 100% 307 2
wiki_linguistics 143.08 1720 100% 893 2
wiki_physical_science 302.58 842 100% 481 2
wiki_history 240.60 961 100% 553 2
early_modern_science 178.75 973 100% 641 2
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 287.30 668 100% 454 2
eu_parliament_debates 1252.70 195 100% 101 2
openstax_science 336.84 669 100% 419 2
openstax_society 593.48 358 100% 218 2
wpa_life_histories 56.74 2559 100% 1395 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.