Base Difficulty

Base difficulty: Level 221 edit

Level distribution for noun (concept_idea): 19: 2 20: 3 26: 1 27: 1 221: 29 270: 31 274: 37 275: 31 280: 29 380: 2 1000: 1 1030: 1 1060: 5 1070: 6 1110: 7 1120: 1

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
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 83.83 586 50% 1172 downrated 1
20th_books 63.57 767 50% 1534 downrated 1
wiki_math 754.94 76 50% 152 downrated 1
wiki_geography 236.38 222 50% 444 downrated 1
wiki_biology 557.26 85 50% 170 downrated 1
wiki_modern_life 422.18 105 50% 210 downrated 1
wiki_arts 554.82 81 50% 162 downrated 1
wiki_society 492.17 86 50% 172 downrated 1
wiki_linguistics 1018.37 59 50% 118 downrated 1
wiki_physical_science 828.86 54 50% 108 downrated 1
wiki_history 212.17 219 50% 438 downrated 1
early_modern_science 377.08 137 50% 274 downrated 1
religious_translated 257.17 233 50% 466 downrated 1
cooking 250.96 299 50% 598 downrated 1
legal_scotus 122.83 518 50% 1036 downrated 1
eu_parliament_debates 135.04 458 50% 916 downrated 1
openstax_science 605.00 76 50% 152 downrated 1
openstax_society 281.25 199 50% 398 downrated 1
wpa_life_histories 50.64 984 50% 1968 downrated 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.