Base Difficulty

Base difficulty: Level 321 edit

Level distribution for verb (change): 22: 4 28: 1 109: 1 140: 1 162: 2 194: 1 254: 1 255: 1 309: 2 311: 1 321: 16 410: 2 415: 2 475: 5 1040: 1 1090: 1 1399: 38

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: 398 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 144.70 754 50% 619 4
20th_books 107.26 1172 50% 804 4
wiki_math 67.37 2335 50% 1307 3
wiki_geography 364.38 555 100% 360 4
wiki_biology 720.56 286 50% 173 4
wiki_modern_life 490.49 434 50% 271 4
wiki_arts 211.76 1451 100% 651 4
wiki_society 409.89 479 50% 315 4
wiki_linguistics 162.83 1704 100% 742 4
wiki_physical_science 894.26 323 50% 150 4
wiki_history 347.63 617 100% 368 4
early_modern_science 474.00 292 50% 230 4
religious_translated 452.60 253 50% 239 5
cooking 51.82 1644 50% 1727 downrated 2
legal_scotus 394.23 315 50% 312 4
eu_parliament_debates 250.63 856 50% 453 4
openstax_science 1015.70 184 50% 119 5
openstax_society 440.67 439 50% 309 4
wpa_life_histories 174.10 608 50% 546 4

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.