Base Difficulty

Base difficulty: Level 17 edit

Level distribution for adjective (physical_property): 3: 1 8: 2 11: 11 14: 20 17: 9 18: 7 20: 2 27: 3 133: 1 179: 1 249: 1 330: 1 340: 1 355: 38 360: 1 370: 2 379: 1 380: 1 420: 1 1000: 1 1010: 3 1040: 8 1050: 5 1090: 2 1120: 16 1209: 1 1399: 9

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: 990 (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 B2 (4 of 6) 6900

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 222.48 468 80% 440 3
20th_books 203.61 511 80% 487 3
wiki_math 35.11 2214 80% 2768 downrated 1
wiki_geography 149.09 943 80% 909 2
wiki_biology 203.49 654 80% 656 downrated 2
wiki_modern_life 97.38 1191 80% 1489 downrated 1
wiki_arts 67.13 1640 80% 2050 downrated 1
wiki_society 38.34 2923 80% 3654 downrated 1
wiki_linguistics 25.37 3335 80% 4169 downrated 1
wiki_physical_science 167.47 899 80% 852 2
wiki_history 56.86 1938 80% 2422 downrated 1
early_modern_science 180.43 635 80% 592 3
religious_translated 203.79 486 80% 516 downrated 2
cooking 275.85 444 80% 555 downrated 1
legal_scotus 9.39 6274 80% 7842 downrated 1
eu_parliament_debates 27.37 2673 80% 3341 downrated 1
openstax_science 152.94 1059 80% 903 2
openstax_society 98.55 1521 80% 1342 2
wpa_life_histories 105.76 854 80% 927 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.