Base Difficulty

Base difficulty: Level 221 edit

Level distribution for noun (concept_idea): 19: 2 26: 1 27: 1 221: 28 270: 30 274: 30 275: 28 280: 25 300: 1 360: 1 380: 2 1000: 1 1030: 1 1060: 5 1070: 6 1110: 4 1120: 4 1399: 66

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: 1389 (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 Starters (1 of 3) 325
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 49.32 614 20% 1975 downrated 2
20th_books 50.94 575 20% 1986 downrated 2
wiki_math 356.17 87 20% 343 downrated 2
wiki_geography 124.93 275 20% 919 downrated 2
wiki_biology 52.17 795 20% 2633 downrated 2
wiki_modern_life 163.72 173 20% 618 downrated 2
wiki_arts 122.17 353 20% 895 downrated 2
wiki_society 50.54 822 20% 2679 downrated 2
wiki_linguistics 54.71 706 20% 2386 downrated 2
wiki_physical_science 117.92 441 20% 1146 downrated 2
wiki_history 69.74 553 20% 1789 downrated 2
early_modern_science 127.12 297 20% 849 downrated 2
religious_translated 35.93 961 20% 2880 downrated 2
cooking 33.58 754 20% 3770 downrated 1
legal_scotus 81.60 348 20% 1477 downrated 2
eu_parliament_debates 61.13 543 20% 1974 downrated 2
openstax_science 126.59 354 20% 1018 downrated 2
openstax_society 70.35 619 20% 1998 downrated 2
wpa_life_histories 72.06 388 20% 1513 downrated 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.