Base Difficulty

Base difficulty: Level 19 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: 411 (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 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 123.36 781 99% 770 2
20th_books 81.57 1191 99% 1170 2
wiki_math 50.17 1981 99% 2001 downrated 1
wiki_geography 285.08 447 99% 434 2
wiki_biology 76.59 1783 99% 1801 downrated 1
wiki_modern_life 211.86 604 99% 594 2
wiki_arts 2088.10 45 99% 45 2
wiki_society 221.24 583 99% 566 2
wiki_linguistics 52.33 2284 99% 2307 downrated 1
wiki_physical_science 34.39 3599 99% 3635 downrated 1
wiki_history 375.68 285 99% 283 2
early_modern_science 107.84 1066 99% 1077 downrated 1
religious_translated 770.83 161 99% 161 2
cooking 52.42 1707 99% 1724 downrated 1
legal_scotus 44.01 2642 99% 2546 2
eu_parliament_debates 13.98 4618 99% 4664 downrated 1
openstax_science 0.00 — — — 0
openstax_society 168.23 859 99% 844 2
wpa_life_histories 86.99 1118 99% 1099 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.