Base Difficulty

Base difficulty: Level 6 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: 214 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
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 950.40 140 100% 128 3
20th_books 1101.86 124 100% 114 3
wiki_math 38.00 2449 100% 2449 1
wiki_geography 271.01 544 100% 473 2
wiki_biology 443.01 304 100% 265 2
wiki_modern_life 317.56 390 100% 364 2
wiki_arts 623.50 174 100% 164 2
wiki_society 804.40 121 100% 115 2
wiki_linguistics 142.55 979 100% 883 2
wiki_physical_science 557.19 236 100% 218 2
wiki_history 948.30 97 100% 94 2
early_modern_science 629.79 168 100% 161 2
religious_translated 1516.45 88 100% 81 2
cooking 113.78 1042 100% 1042 1
legal_scotus 359.03 349 100% 332 2
eu_parliament_debates 302.87 501 100% 404 2
openstax_science 648.34 169 100% 161 2
openstax_society 1091.36 109 100% 96 2
wpa_life_histories 924.82 157 100% 133 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.