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: 420 (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 11.47 5924 100% 5924 1
20th_books 14.30 4906 100% 4906 1
wiki_math 863.85 242 100% 155 2
wiki_geography 213.15 1216 100% 651 2
wiki_biology 713.67 280 100% 162 2
wiki_modern_life 452.35 431 100% 272 2
wiki_arts 436.42 377 100% 269 2
wiki_society 343.27 491 100% 361 2
wiki_linguistics 564.83 288 100% 219 2
wiki_physical_science 979.19 149 100% 111 2
wiki_history 205.17 993 100% 655 2
early_modern_science 224.39 521 100% 473 2
religious_translated 0.00 — — — 0
cooking 27.04 2592 100% 2592 1
legal_scotus 118.19 1235 100% 1038 2
eu_parliament_debates 156.71 1355 100% 729 2
openstax_science 1094.27 154 100% 94 2
openstax_society 311.26 724 100% 456 2
wpa_life_histories 19.94 3899 100% 3899 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.