Derives seasonal factors from monthly or quarterly data.
Multi-period series — Time period. Longer terms spread cost but increase total interest; choose realistic horizon. Example: 0.1.
Multi-period series is required
period length — Time period. Longer terms spread cost but increase total interest; choose realistic horizon. Example: 0.1.
period length is required
Derives seasonal factors from monthly or quarterly data.
Formula
seasonalIndices = (multiPeriodSeries + periodLength) ÷ 2