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: 968 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cambridge_yle Movers (2 of 3) 750
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 77.54 1499 80% 1162 2
20th_books 85.99 1322 80% 1065 2
wiki_math 0.00 — — — 0
wiki_geography 233.36 721 80% 569 2
wiki_biology 142.30 1401 80% 982 2
wiki_modern_life 104.43 1460 80% 1380 2
wiki_arts 392.75 205 80% 256 downrated 1
wiki_society 21.36 4792 80% 5990 downrated 1
wiki_linguistics 24.51 3424 80% 4280 downrated 1
wiki_physical_science 599.61 299 80% 217 2
wiki_history 62.02 1754 80% 2192 downrated 1
early_modern_science 294.03 507 80% 373 2
religious_translated 75.41 1522 80% 1293 2
cooking 0.00 — — — 0
legal_scotus 7.61 7107 80% 8884 downrated 1
eu_parliament_debates 0.00 — — — 0
openstax_science 119.69 1527 80% 1133 2
openstax_society 21.83 4198 80% 5248 downrated 1
wpa_life_histories 82.46 1448 80% 1137 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.