Base Difficulty

Base difficulty: Level 249 edit

Level distribution for noun (spatial_division): 249: 11 254: 2 350: 1 460: 1 1078: 1 1200: 4 1201: 1 1202: 3 1203: 2 1204: 9 1206: 3 1207: 4 1208: 1 1209: 5 1210: 4 1211: 4 1212: 1 1213: 1 1217: 2 1219: 1 1220: 1 1226: 5 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: 581 (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 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 46.89 2596 80% 1762 2
20th_books 82.37 1713 80% 1062 2
wiki_math 0.00 — — — 0
wiki_geography 1284.47 132 80% 77 2
wiki_biology 301.13 545 100% 433 2
wiki_modern_life 204.30 731 100% 652 2
wiki_arts 212.30 807 100% 624 2
wiki_society 259.72 540 100% 478 2
wiki_linguistics 443.59 331 100% 279 2
wiki_physical_science 115.51 2118 80% 1229 2
wiki_history 506.01 277 100% 216 2
early_modern_science 111.93 1388 80% 1015 2
religious_translated 156.25 686 80% 661 2
cooking 23.44 2434 80% 3042 downrated 1
legal_scotus 16.27 6278 80% 4050 2
eu_parliament_debates 87.08 1461 100% 1200 2
openstax_science 23.27 3890 80% 4862 downrated 1
openstax_society 277.70 629 100% 503 2
wpa_life_histories 178.28 745 80% 569 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.