Base Difficulty

Base difficulty: Level 221 edit

Level distribution for noun (concept_idea): 19: 2 26: 1 27: 1 221: 28 270: 30 274: 30 275: 28 280: 25 300: 1 360: 1 380: 2 1000: 1 1030: 1 1060: 5 1070: 6 1110: 4 1120: 4 1399: 66

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: 310 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 655.23 205 100% 173 2
20th_books 585.37 231 100% 201 2
wiki_math 910.05 280 100% 152 2
wiki_geography 432.70 335 100% 281 2
wiki_biology 430.80 359 100% 286 2
wiki_modern_life 636.77 186 100% 159 2
wiki_arts 369.02 408 100% 322 2
wiki_society 166.59 1045 100% 817 2
wiki_linguistics 133.28 1266 100% 924 2
wiki_physical_science 284.14 648 100% 501 2
wiki_history 282.40 657 100% 458 2
early_modern_science 745.70 190 100% 140 2
religious_translated 359.64 362 100% 299 2
cooking 829.35 299 100% 184 2
legal_scotus 98.16 1631 100% 1210 2
eu_parliament_debates 219.71 857 100% 533 2
openstax_science 550.67 226 100% 199 2
openstax_society 272.41 743 100% 516 2
wpa_life_histories 559.74 243 100% 211 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.