kurtosis
C2CEFR level
90/100Rarity: very rare
TechnicalRegister
A measure of how heavy or light a distribution's tails are relative to a normal curve.
The returns show high kurtosis, meaning extreme days happen far more often than a bell curve would predict.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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