Base Difficulty

Base difficulty: Level 19 edit

Level distribution for noun (knowledge_domain): 19: 4 329: 28 1000: 13 1010: 4 1030: 2 1040: 2 1050: 2 1060: 14 1080: 4 1110: 24 1120: 3 1399: 21

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: 670 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cambridge_yle Flyers (3 of 3) 1200
cefr A1 (1 of 6) 800

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 43.77 2020 100% 2020 1
20th_books 25.87 3152 100% 3152 1
wiki_math 535.52 350 100% 265 2
wiki_geography 124.39 1584 100% 1125 2
wiki_biology 41.19 3211 100% 3211 1
wiki_modern_life 160.97 850 100% 850 1
wiki_arts 194.74 828 100% 679 2
wiki_society 599.63 219 100% 178 2
wiki_linguistics 127.06 1301 100% 959 2
wiki_physical_science 356.55 472 100% 387 2
wiki_history 263.22 564 100% 469 2
early_modern_science 471.34 258 100% 227 2
religious_translated 50.86 1916 100% 1916 1
cooking 31.54 2362 100% 2362 1
legal_scotus 12.75 5982 100% 5982 1
eu_parliament_debates 33.13 2735 100% 2735 1
openstax_science 303.61 489 100% 436 2
openstax_society 167.27 998 100% 816 2
wpa_life_histories 6.86 7916 100% 7916 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.