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: 3821 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cambridge_yle Flyers (3 of 3) 1200
cefr A2 (2 of 6) 2100

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 10.15 7948 50% 5611 3
20th_books 7.05 7074 50% 7986 downrated 2
wiki_math 0.00 — — — 0
wiki_geography 26.38 2618 50% 5236 downrated 1
wiki_biology 0.00 — — — 0
wiki_modern_life 0.00 — — — 0
wiki_arts 68.06 3325 50% 1951 4
wiki_society 24.58 4907 50% 5098 downrated 2
wiki_linguistics 0.00 — — — 0
wiki_physical_science 0.00 — — — 0
wiki_history 16.45 3980 50% 7960 downrated 1
early_modern_science 0.00 — — — 0
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 5.97 6207 50% 12414 downrated 1
eu_parliament_debates 6.69 4768 50% 9536 downrated 1
openstax_science 74.39 2004 50% 1617 4
openstax_society 102.31 1542 50% 1215 5
wpa_life_histories 0.00 — — — 0

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.