Base Difficulty

Base difficulty: Level 3 edit

Level distribution for noun (body_part): 3: 14 8: 14 15: 10 160: 40 1010: 22 1060: 1 1090: 2

Per-Language Difficulty Overrides

No difficulty overrides set. The base difficulty level will be used for all languages.

Add Difficulty Override
-1 to exclude, 1-1299 for level
Frequency and Tier Signals
Combined Frequency Rank: — (run python -m storage.admin --calc-ranks to populate)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cambridge_yle Starters (1 of 3) 325
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 587.68 288 100% 181 2
20th_books 561.32 283 100% 195 2
wiki_math 19.77 3553 100% 3553 1
wiki_geography 113.00 2064 100% 1122 2
wiki_biology 341.45 556 100% 379 2
wiki_modern_life 266.65 919 100% 526 2
wiki_arts 159.54 1610 100% 831 2
wiki_society 64.12 3865 100% 1986 2
wiki_linguistics 53.33 2963 100% 1768 2
wiki_physical_science 156.32 1725 100% 910 2
wiki_history 96.73 2536 100% 1315 2
early_modern_science 899.56 145 100% 117 2
religious_translated 364.68 439 100% 289 2
cooking 77.05 1358 100% 1358 1
legal_scotus 64.96 2513 100% 1587 2
eu_parliament_debates 31.99 3359 100% 2032 2
openstax_science 155.14 1583 100% 877 2
openstax_society 96.84 2057 100% 1346 2
wpa_life_histories 572.52 315 100% 199 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.