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: 491 (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 150.83 685 100% 597 3
20th_books 130.19 897 100% 695 3
wiki_math 35.70 3625 100% 1901 2
wiki_geography 641.82 424 100% 198 3
wiki_biology 0.00 — — — 0
wiki_modern_life 513.26 598 100% 259 3
wiki_arts 407.81 794 100% 327 3
wiki_society 733.80 335 100% 158 4
wiki_linguistics 49.12 3884 100% 1968 2
wiki_physical_science 0.00 — — — 0
wiki_history 405.85 646 100% 318 3
early_modern_science 66.03 2625 100% 1558 2
religious_translated 117.96 1050 100% 829 2
cooking 100.26 1395 100% 900 2
legal_scotus 240.36 1339 100% 510 4
eu_parliament_debates 412.50 393 100% 299 2
openstax_science 168.63 1627 100% 773 3
openstax_society 503.45 532 100% 274 3
wpa_life_histories 432.15 421 100% 239 4

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.