Base Difficulty

Base difficulty: Level 9 edit

Level distribution for adverb (relative_time): 6: 3 9: 3 22: 5 225: 9 1030: 1 1399: 4

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: 244 (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 1045.02 124 100% 124 1
20th_books 952.42 136 100% 136 1
wiki_math 291.03 465 100% 465 1
wiki_geography 469.02 226 100% 226 1
wiki_biology 443.07 247 100% 247 1
wiki_modern_life 600.92 157 100% 157 1
wiki_arts 503.82 198 100% 198 1
wiki_society 447.61 228 100% 228 1
wiki_linguistics 677.15 176 100% 176 1
wiki_physical_science 461.10 267 100% 267 1
wiki_history 499.67 189 100% 189 1
early_modern_science 709.25 145 100% 145 1
religious_translated 488.95 242 100% 242 1
cooking 175.79 731 100% 731 1
legal_scotus 221.61 572 100% 572 1
eu_parliament_debates 759.52 159 100% 159 1
openstax_science 360.74 345 100% 345 1
openstax_society 555.15 202 100% 202 1
wpa_life_histories 706.74 170 100% 170 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.