Base Difficulty

Base difficulty: Level 214 edit

Level distribution for verb (perception): 5: 1 8: 2 185: 1 205: 1 214: 12 230: 1 265: 1 279: 1 455: 1 1040: 1 1399: 4

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: 3295 (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 35.89 1322 27% 2359 downrated 3
20th_books 38.37 1521 27% 2217 downrated 3
wiki_math 11.70 2231 27% 8000 capped 1
wiki_geography 8.59 4147 27% 9000 capped 1
wiki_biology 13.76 2635 27% 9000 capped 1
wiki_modern_life 16.95 2312 27% 8670 downrated 1
wiki_arts 13.92 2657 27% 9964 downrated 1
wiki_society 18.77 1992 27% 7470 downrated 1
wiki_linguistics 6.74 3904 27% 9000 capped 1
wiki_physical_science 11.98 2957 27% 8000 capped 1
wiki_history 13.25 2744 27% 9000 capped 1
early_modern_science 16.30 1865 27% 6994 downrated 1
religious_translated 25.48 1471 27% 3673 downrated 2
cooking 0.00 — — — 0
legal_scotus 115.42 420 27% 1026 downrated 4
eu_parliament_debates 7.42 3091 27% 11000 capped 1
openstax_science 29.00 1744 27% 4262 downrated 2
openstax_society 19.95 1851 27% 6941 downrated 1
wpa_life_histories 15.52 3016 27% 4631 downrated 3

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.