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: 7237 (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 7.82 1473 8% 11438 downrated 2
20th_books 5.33 2344 8% 15634 downrated 2
wiki_math 5.49 2100 8% 8000 capped 2
wiki_geography 6.30 3186 8% 9000 capped 2
wiki_biology 7.31 2644 8% 9000 capped 2
wiki_modern_life 8.39 2445 8% 10000 capped 2
wiki_arts 7.93 2776 8% 10000 capped 2
wiki_society 7.66 2491 8% 11000 capped 2
wiki_linguistics 63.19 290 8% 1962 downrated 2
wiki_physical_science 0.00 — — — 0
wiki_history 7.33 2514 8% 9000 capped 2
early_modern_science 8.04 2054 8% 10400 capped 2
religious_translated 8.86 1352 8% 10400 capped 2
cooking 3.00 2174 8% 5200 capped 1
legal_scotus 25.60 485 8% 4873 downrated 2
eu_parliament_debates 4.53 2730 8% 11000 capped 2
openstax_science 3.60 4448 8% 11000 capped 2
openstax_society 4.58 3561 8% 11000 capped 2
wpa_life_histories 5.34 2209 8% 16129 downrated 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.