Base Difficulty

Base difficulty: Level 1399 edit

Level distribution for verb (rule_defined_action): 415: 1 475: 5 485: 2 1200: 1 1202: 3 1203: 1 1204: 2 1205: 3 1206: 3 1208: 3 1211: 1 1214: 5 1220: 4 1224: 1 1226: 3 1399: 7

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: 2228 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cambridge_yle Flyers (3 of 3) 1200
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 42.45 1304 50% 2076 downrated 2
20th_books 96.56 738 50% 936 downrated 4
wiki_math 0.00 — — — 0
wiki_geography 39.40 2125 50% 3533 downrated 2
wiki_biology 13.61 4333 50% 8666 downrated 1
wiki_modern_life 159.13 875 50% 895 downrated 3
wiki_arts 24.87 2786 50% 5572 downrated 1
wiki_society 75.26 1119 50% 1810 downrated 2
wiki_linguistics 0.00 — — — 0
wiki_physical_science 0.00 — — — 0
wiki_history 44.46 1508 50% 3016 downrated 1
early_modern_science 73.62 1207 50% 1558 downrated 2
religious_translated 108.29 545 50% 972 downrated 2
cooking 0.00 — — — 0
legal_scotus 125.14 559 50% 992 downrated 2
eu_parliament_debates 9.98 3756 50% 7512 downrated 1
openstax_science 9.97 5106 50% 10212 downrated 1
openstax_society 148.89 497 50% 876 downrated 2
wpa_life_histories 72.66 974 50% 1197 downrated 4

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.