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: 1516 (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 8.13 3357 33% 10071 downrated 1
20th_books 14.58 1980 33% 5940 downrated 1
wiki_math 92.01 492 33% 1476 downrated 1
wiki_geography 150.31 241 33% 723 downrated 1
wiki_biology 103.67 429 33% 1172 downrated 2
wiki_modern_life 222.06 164 33% 447 downrated 2
wiki_arts 55.83 772 33% 2316 downrated 1
wiki_society 136.41 292 33% 813 downrated 2
wiki_linguistics 19.88 2097 33% 6291 downrated 1
wiki_physical_science 66.18 727 33% 2181 downrated 1
wiki_history 150.43 219 33% 657 downrated 1
early_modern_science 13.04 2750 33% 8250 downrated 1
religious_translated 33.04 1255 33% 2948 downrated 2
cooking 0.00 — — — 0
legal_scotus 106.59 446 33% 1146 downrated 2
eu_parliament_debates 132.13 411 33% 925 downrated 2
openstax_science 142.13 359 33% 893 downrated 2
openstax_society 219.36 185 33% 521 downrated 2
wpa_life_histories 9.41 2944 33% 8832 downrated 1

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.