Base Difficulty

Base difficulty: Level 1399 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: 1951 (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 Movers (2 of 3) 750
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 63.30 354 20% 1592 downrated 2
20th_books 41.55 585 20% 2410 downrated 2
wiki_math 17.74 1365 20% 6825 downrated 1
wiki_geography 48.32 515 20% 2575 downrated 1
wiki_biology 93.62 231 20% 1155 downrated 1
wiki_modern_life 41.47 609 20% 3045 downrated 1
wiki_arts 61.68 526 20% 2043 downrated 2
wiki_society 64.52 420 20% 1819 downrated 2
wiki_linguistics 112.92 234 20% 1077 downrated 2
wiki_physical_science 85.00 305 20% 1525 downrated 1
wiki_history 33.86 764 20% 3820 downrated 1
early_modern_science 129.13 167 20% 780 downrated 2
religious_translated 77.22 310 20% 1405 downrated 2
cooking 19.38 1175 20% 5200 capped 1
legal_scotus 105.62 267 20% 1114 downrated 2
eu_parliament_debates 97.50 260 20% 1194 downrated 2
openstax_science 87.80 305 20% 1382 downrated 2
openstax_society 39.21 894 20% 3486 downrated 2
wpa_life_histories 52.70 457 20% 1984 downrated 2

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.