Base Difficulty

Base difficulty: Level 300 edit

Level distribution for verb (development): 30: 1 165: 2 170: 1 179: 1 196: 1 249: 1 278: 1 299: 2 300: 1 329: 1 470: 7 475: 1 1399: 6

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: 1055 (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 33.63 4746 100% 2018 3
20th_books 25.24 6059 100% 2361 3
wiki_math 66.98 2489 100% 1323 2
wiki_geography 160.23 2000 100% 864 3
wiki_biology 103.55 2322 100% 1309 2
wiki_modern_life 385.80 814 100% 358 4
wiki_arts 71.03 3587 100% 1888 2
wiki_society 154.39 1869 100% 899 3
wiki_linguistics 25.26 3887 100% 3887 1
wiki_physical_science 124.75 2242 100% 1136 2
wiki_history 113.45 2139 100% 1205 2
early_modern_science 58.85 2582 100% 1715 2
religious_translated 0.00 — — — 0
cooking 118.32 1890 100% 685 3
legal_scotus 29.55 4877 100% 2374 3
eu_parliament_debates 532.69 491 100% 217 5
openstax_science 152.94 1613 100% 840 3
openstax_society 251.74 1076 100% 546 3
wpa_life_histories 30.92 4759 100% 2152 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.