Base Difficulty

Base difficulty: Level 22 edit

Level distribution for noun (time_period): 6: 4 22: 25 220: 15 405: 3 1030: 2 1050: 1 1070: 1 1120: 4 1200: 1 1202: 2 1399: 14

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: 158 (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 40.96 3712 97% 1935 2
20th_books 30.63 3850 97% 2346 2
wiki_math 752.49 192 97% 176 2
wiki_geography 1887.08 49 97% 45 2
wiki_biology 678.71 172 97% 158 2
wiki_modern_life 1302.96 67 97% 65 2
wiki_arts 2222.43 48 97% 45 2
wiki_society 1487.68 61 97% 56 2
wiki_linguistics 2045.33 64 97% 56 2
wiki_physical_science 558.19 240 97% 220 2
wiki_history 1940.05 48 97% 46 2
early_modern_science 259.02 667 97% 433 2
religious_translated 57.82 2472 97% 1541 2
cooking 0.00 — — — 0
legal_scotus 99.20 1558 97% 1199 2
eu_parliament_debates 72.16 1750 97% 1332 2
openstax_science 101.62 1987 97% 1266 2
openstax_society 650.38 226 97% 185 2
wpa_life_histories 20.66 3440 97% 3543 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.