Base Difficulty

Base difficulty: Level 275 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: 7659 (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 8.57 1240 10% 10234 downrated 2
20th_books 5.49 1839 10% 14974 downrated 2
wiki_math 0.00 — — — 0
wiki_geography 14.36 1807 10% 9000 capped 2
wiki_biology 0.00 — — — 0
wiki_modern_life 17.28 1165 10% 8406 downrated 2
wiki_arts 13.91 1863 10% 10000 capped 2
wiki_society 19.82 1113 10% 7024 downrated 2
wiki_linguistics 7.69 2553 10% 9000 capped 2
wiki_physical_science 0.00 — — — 0
wiki_history 8.47 1597 10% 9000 capped 1
early_modern_science 9.04 1992 10% 10400 capped 2
religious_translated 14.48 756 10% 7560 downrated 1
cooking 0.00 — — — 0
legal_scotus 14.07 1428 10% 8972 downrated 2
eu_parliament_debates 19.65 896 10% 5905 downrated 2
openstax_science 9.39 2376 10% 11000 capped 2
openstax_society 21.99 933 10% 6412 downrated 2
wpa_life_histories 4.37 2688 10% 18434 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.