Base Difficulty

Base difficulty: Level 270 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: 660 (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 Movers (2 of 3) 750
cefr A1 (1 of 6) 800

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 122.33 684 77% 760 downrated 2
20th_books 156.46 586 77% 646 downrated 2
wiki_math 53.30 1618 77% 2103 downrated 1
wiki_geography 190.00 504 77% 655 downrated 1
wiki_biology 140.99 740 77% 962 downrated 1
wiki_modern_life 329.30 226 77% 294 downrated 1
wiki_arts 205.59 430 77% 559 downrated 1
wiki_society 92.78 1146 77% 1490 downrated 1
wiki_linguistics 76.48 1308 77% 1700 downrated 1
wiki_physical_science 121.26 923 77% 1200 downrated 1
wiki_history 108.23 947 77% 1231 downrated 1
early_modern_science 180.20 557 77% 599 downrated 2
religious_translated 29.18 2467 77% 3207 downrated 1
cooking 1088.69 123 77% 141 downrated 2
legal_scotus 10.12 5868 77% 7628 downrated 1
eu_parliament_debates 44.54 1843 77% 2396 downrated 1
openstax_science 137.47 796 77% 1035 downrated 1
openstax_society 95.71 1148 77% 1492 downrated 1
wpa_life_histories 197.19 459 77% 536 downrated 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.