stationarity
C2CEFR level
90/100Rarity: very rare
TechnicalRegister
The property of a time series whose statistical characteristics, such as mean and variance, stay constant over time.
Before forecasting revenue we have to difference the series, because the raw numbers fail every stationarity test.
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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