Base Difficulty

Base difficulty: Level 1399 edit

Level distribution for noun (mental_construct): 265: 27 300: 1 390: 2 460: 1 1060: 6 1070: 1 1120: 1 1399: 30

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: 3665 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
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 9.89 2416 20% 8324 downrated 2
20th_books 8.88 2593 20% 8799 downrated 2
wiki_math 58.73 600 20% 2214 downrated 2
wiki_geography 14.20 3236 20% 9000 capped 2
wiki_biology 25.79 1788 20% 5323 downrated 2
wiki_modern_life 85.89 375 20% 1393 downrated 2
wiki_arts 94.06 500 20% 1289 downrated 2
wiki_society 49.20 1108 20% 2795 downrated 2
wiki_linguistics 10.25 3388 20% 9000 capped 2
wiki_physical_science 39.93 1415 20% 3666 downrated 2
wiki_history 38.60 1191 20% 3450 downrated 2
early_modern_science 26.26 1193 20% 4297 downrated 2
religious_translated 28.27 1042 20% 3529 downrated 2
cooking 0.00 — — — 0
legal_scotus 8.09 3451 20% 11424 downrated 2
eu_parliament_debates 5.82 2981 20% 11000 capped 1
openstax_science 125.35 258 20% 959 downrated 2
openstax_society 44.69 1101 20% 3149 downrated 2
wpa_life_histories 1.42 7680 20% 20000 capped 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.