Base Difficulty

Base difficulty: Level 470 edit

Level distribution for verb (directional_movement): 5: 6 23: 4 26: 3 28: 2 120: 1 135: 2 145: 5 210: 1 254: 1 300: 1 330: 2 415: 1 460: 1 470: 9 1040: 1 1050: 2 1120: 1 1399: 18

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: 531 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cefr B1 (3 of 6) 4200

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 302.80 440 33% 310 5
20th_books 278.07 410 33% 340 5
wiki_math 119.34 1158 100% 1042 2
wiki_geography 366.86 706 100% 367 4
wiki_biology 183.41 1066 100% 742 3
wiki_modern_life 167.24 1198 100% 865 2
wiki_arts 209.01 859 100% 636 3
wiki_society 238.16 727 100% 556 3
wiki_linguistics 209.95 1133 100% 611 3
wiki_physical_science 347.40 640 100% 407 3
wiki_history 212.90 939 100% 628 3
early_modern_science 370.83 644 100% 301 5
religious_translated 404.36 596 100% 259 5
cooking 710.66 358 100% 181 6
legal_scotus 88.24 1608 100% 1297 3
eu_parliament_debates 128.45 1257 100% 783 3
openstax_science 254.76 897 100% 536 3
openstax_society 506.51 445 100% 260 5
wpa_life_histories 86.72 1391 33% 975 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.