Base Difficulty

Base difficulty: Level 299 edit

Level distribution for noun (social_institution): 299: 40 315: 1 360: 1 405: 1 1020: 2 1030: 7 1040: 1 1060: 11 1070: 7 1120: 9 1399: 25

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: 524 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cefr B1 (3 of 6) 4200

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 119.85 939 100% 765 2
20th_books 97.59 1227 100% 934 2
wiki_math 0.00 — — — 0
wiki_geography 707.92 297 100% 163 2
wiki_biology 0.00 — — — 0
wiki_modern_life 550.88 296 100% 204 2
wiki_arts 110.63 2166 100% 1249 2
wiki_society 666.28 327 100% 167 2
wiki_linguistics 66.20 2808 100% 1624 2
wiki_physical_science 32.23 3808 100% 3808 1
wiki_history 245.72 715 100% 535 2
early_modern_science 51.23 2165 100% 2165 1
religious_translated 206.33 636 100% 508 2
cooking 54.07 1695 100% 1695 1
legal_scotus 524.02 438 100% 237 2
eu_parliament_debates 636.54 264 100% 188 2
openstax_science 132.91 1560 100% 1007 2
openstax_society 580.68 354 100% 223 2
wpa_life_histories 186.68 793 100% 529 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.