Base Difficulty

Base difficulty: Level 10 edit

Level distribution for adverb (direction): 10: 2 249: 6 1020: 1 1120: 1

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: 2567 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 98.26 181 14% 1267 downrated 1
20th_books 99.88 178 14% 1246 downrated 1
wiki_math 61.37 329 14% 2303 downrated 1
wiki_geography 45.03 384 14% 2688 downrated 1
wiki_biology 39.43 452 14% 3164 downrated 1
wiki_modern_life 32.02 547 14% 3829 downrated 1
wiki_arts 39.41 412 14% 2884 downrated 1
wiki_society 24.71 752 14% 5264 downrated 1
wiki_linguistics 43.45 427 14% 2989 downrated 1
wiki_physical_science 21.84 957 14% 6699 downrated 1
wiki_history 80.23 168 14% 1176 downrated 1
early_modern_science 42.85 360 14% 2520 downrated 1
religious_translated 46.87 334 14% 2338 downrated 1
cooking 52.16 423 14% 2961 downrated 1
legal_scotus 23.56 798 14% 5586 downrated 1
eu_parliament_debates 18.96 903 14% 6321 downrated 1
openstax_science 63.59 249 14% 1743 downrated 1
openstax_society 53.15 330 14% 2310 downrated 1
wpa_life_histories 119.18 154 14% 1078 downrated 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.