Base Difficulty

Base difficulty: Level 4 edit

Level distribution for numeral (cardinal): 4: 31 490: 72

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: 446 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
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 246.19 422 100% 422 1
20th_books 250.93 411 100% 411 1
wiki_math 144.36 930 100% 930 1
wiki_geography 412.49 264 100% 264 1
wiki_biology 445.23 245 100% 245 1
wiki_modern_life 264.07 445 100% 445 1
wiki_arts 331.36 322 100% 322 1
wiki_society 257.85 446 100% 446 1
wiki_linguistics 290.21 448 100% 448 1
wiki_physical_science 152.61 960 100% 960 1
wiki_history 351.81 307 100% 307 1
early_modern_science 320.07 339 100% 339 1
religious_translated 292.86 374 100% 374 1
cooking 1002.88 160 100% 160 1
legal_scotus 127.10 1025 100% 1025 1
eu_parliament_debates 157.56 751 100% 751 1
openstax_science 175.38 816 100% 816 1
openstax_society 233.97 594 100% 594 1
wpa_life_histories 574.53 206 100% 206 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.