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: 611 (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 41.91 2650 80% 1934 2
20th_books 96.63 1617 100% 934 2
wiki_math 0.00 — — — 0
wiki_geography 1085.03 140 80% 94 2
wiki_biology 213.81 906 100% 643 2
wiki_modern_life 132.94 1439 100% 1098 2
wiki_arts 308.83 473 100% 393 2
wiki_society 200.34 800 100% 665 2
wiki_linguistics 518.93 273 100% 237 2
wiki_physical_science 92.62 2346 80% 1477 2
wiki_history 426.92 381 100% 276 2
early_modern_science 113.07 1352 80% 1004 2
religious_translated 84.39 987 80% 1234 downrated 1
cooking 42.82 1941 100% 1941 1
legal_scotus 173.93 778 100% 726 2
eu_parliament_debates 44.83 2235 100% 2235 1
openstax_science 14.30 5457 80% 6821 downrated 1
openstax_society 268.36 713 100% 526 2
wpa_life_histories 290.31 489 80% 367 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.