Base Difficulty

Base difficulty: Level 6 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: 245 (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 286.47 485 100% 346 3
20th_books 334.54 425 50% 311 3
wiki_math 240.79 419 50% 541 downrated 2
wiki_geography 831.80 142 50% 125 3
wiki_biology 588.11 252 50% 192 2
wiki_modern_life 680.35 155 50% 146 2
wiki_arts 1220.06 75 50% 77 downrated 3
wiki_society 675.48 130 50% 149 downrated 2
wiki_linguistics 615.88 203 50% 201 2
wiki_physical_science 427.34 310 50% 317 downrated 2
wiki_history 1345.87 49 50% 67 downrated 2
early_modern_science 250.40 679 100% 441 3
religious_translated 69.78 1557 50% 1393 2
cooking 51.83 2019 50% 1485 2
legal_scotus 228.19 362 50% 518 downrated 3
eu_parliament_debates 160.96 1072 50% 714 3
openstax_science 248.11 372 50% 522 downrated 2
openstax_society 522.70 213 50% 232 downrated 2
wpa_life_histories 449.95 238 50% 254 downrated 3

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.