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: 2573 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cefr B2 (4 of 6) 6900

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 5.34 6232 50% 12464 downrated 1
20th_books 11.36 3487 50% 6974 downrated 1
wiki_math 92.13 905 50% 1334 downrated 2
wiki_geography 0.00 — — — 0
wiki_biology 0.00 — — — 0
wiki_modern_life 0.00 — — — 0
wiki_arts 78.06 1310 50% 1763 downrated 2
wiki_society 113.16 820 50% 1184 downrated 2
wiki_linguistics 61.93 1287 50% 1956 downrated 2
wiki_physical_science 23.99 2808 50% 5616 downrated 1
wiki_history 36.28 1889 50% 3778 downrated 1
early_modern_science 10.63 4336 50% 8672 downrated 1
religious_translated 23.98 2011 50% 4022 downrated 1
cooking 0.00 — — — 0
legal_scotus 273.24 222 50% 408 downrated 2
eu_parliament_debates 22.19 2248 50% 4496 downrated 1
openstax_science 13.08 4181 50% 8362 downrated 1
openstax_society 45.84 2197 50% 2824 downrated 2
wpa_life_histories 0.00 — — — 0

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.