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: 572 (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 52.40 2154 80% 1611 2
20th_books 144.59 884 100% 660 2
wiki_math 0.00 — — — 0
wiki_geography 1434.25 99 80% 68 2
wiki_biology 395.37 453 100% 325 2
wiki_modern_life 158.48 1181 100% 913 2
wiki_arts 182.43 1190 100% 754 2
wiki_society 180.88 1004 100% 757 2
wiki_linguistics 448.53 387 100% 287 2
wiki_physical_science 164.16 1361 80% 886 2
wiki_history 366.88 478 80% 332 2
early_modern_science 230.01 556 80% 480 2
religious_translated 84.70 980 80% 1225 downrated 1
cooking 0.00 — — — 0
legal_scotus 21.45 5424 100% 3476 2
eu_parliament_debates 60.37 2372 100% 1508 2
openstax_science 25.27 3694 80% 4617 downrated 1
openstax_society 303.99 597 100% 457 2
wpa_life_histories 265.49 604 80% 397 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.