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: 430 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cambridge_yle Starters (1 of 3) 325
cefr A1 (1 of 6) 800

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 952.44 139 100% 127 3
20th_books 1002.80 139 100% 126 3
wiki_math 0.00 — — — 0
wiki_geography 123.74 1504 100% 1122 2
wiki_biology 165.82 822 100% 822 1
wiki_modern_life 73.11 2039 100% 2039 1
wiki_arts 140.08 958 100% 958 1
wiki_society 86.87 1640 100% 1640 1
wiki_linguistics 34.17 3165 100% 3165 1
wiki_physical_science 126.68 1147 100% 1147 1
wiki_history 107.63 1232 100% 1232 1
early_modern_science 388.61 301 100% 274 2
religious_translated 481.89 270 100% 238 2
cooking 295.16 502 100% 502 1
legal_scotus 24.48 3971 100% 3971 1
eu_parliament_debates 25.16 3251 100% 3251 1
openstax_science 83.48 1653 100% 1653 1
openstax_society 86.32 1602 100% 1602 1
wpa_life_histories 1075.69 135 100% 118 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.