Base Difficulty

Base difficulty: Level 26 edit

Level distribution for noun (path_infrastructure): 24: 1 26: 8 115: 2 135: 1 219: 3 255: 9 405: 2 1020: 2 1050: 1 1399: 10

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: 848 (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 50.18 2012 97% 1644 2
20th_books 75.97 1306 97% 1186 2
wiki_math 28.03 2921 97% 3009 downrated 1
wiki_geography 104.99 2057 97% 1324 2
wiki_biology 342.24 583 97% 390 2
wiki_modern_life 271.59 679 97% 498 2
wiki_arts 479.52 237 97% 220 2
wiki_society 176.85 1255 97% 793 2
wiki_linguistics 197.75 1069 97% 654 2
wiki_physical_science 263.68 826 97% 549 2
wiki_history 210.52 720 97% 612 2
early_modern_science 92.53 1834 97% 1193 2
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 90.58 1655 97% 1303 2
eu_parliament_debates 206.19 658 97% 549 2
openstax_science 298.59 782 97% 476 2
openstax_society 261.26 723 97% 539 2
wpa_life_histories 96.59 1089 97% 1002 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.