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: 5188 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cambridge_yle Movers (2 of 3) 750
cefr B2 (4 of 6) 6900

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 14.80 1242 20% 6210 downrated 1
20th_books 31.97 647 20% 3235 downrated 1
wiki_math 26.10 1014 20% 5070 downrated 1
wiki_geography 15.81 1789 20% 8945 downrated 1
wiki_biology 44.31 584 20% 2920 downrated 1
wiki_modern_life 48.35 498 20% 2490 downrated 1
wiki_arts 23.59 1158 20% 5790 downrated 1
wiki_society 14.11 1988 20% 9940 downrated 1
wiki_linguistics 13.33 1916 20% 9000 capped 1
wiki_physical_science 39.81 722 20% 3610 downrated 1
wiki_history 13.40 2051 20% 9000 capped 1
early_modern_science 10.02 2217 20% 10400 capped 1
religious_translated 0.00 — — — 0
cooking 41.92 627 20% 3135 downrated 1
legal_scotus 8.14 2787 20% 13935 downrated 1
eu_parliament_debates 5.63 3056 20% 11000 capped 1
openstax_science 65.66 386 20% 1930 downrated 1
openstax_society 11.90 2275 20% 11000 capped 1
wpa_life_histories 27.16 765 20% 3825 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.