Base Difficulty

Base difficulty: Level 23 edit

Level distribution for adverb (location): 18: 4 23: 22 250: 13 1070: 1 1120: 5 1205: 1 1221: 1 1399: 2

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: 391 (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 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 600.95 220 100% 184 3
20th_books 540.31 247 100% 207 3
wiki_math 124.38 1066 100% 1066 1
wiki_geography 300.39 471 100% 416 2
wiki_biology 256.78 493 100% 493 1
wiki_modern_life 202.87 631 100% 631 1
wiki_arts 198.34 640 100% 640 1
wiki_society 153.86 863 100% 863 1
wiki_linguistics 192.73 695 100% 695 1
wiki_physical_science 328.32 475 100% 412 2
wiki_history 256.82 451 100% 451 1
early_modern_science 942.31 125 100% 109 2
religious_translated 410.54 297 100% 268 2
cooking 120.54 986 100% 986 1
legal_scotus 274.15 467 100% 441 2
eu_parliament_debates 568.16 222 100% 222 1
openstax_science 385.43 425 100% 337 2
openstax_society 331.23 417 100% 383 2
wpa_life_histories 418.43 308 100% 271 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.