HP 12C#ABA hp 12c_solutions handbook_English_E.pdf - Page 156
Simple Moving Average, Seasonal Variation Factors Based on a Centered Moving Average
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Simple Moving Average • X = moving average. • m = number of elements in moving average. • X1 = X-----1----+-----X----2----+-----X----3-----+-----X.--.--n.--m-x---m-m--- m • X2 = X-----1----+-----X----2----+-----X----3-----+-----X-.--.-n-.-m-x---m-m------+-----1- m • etc. Seasonal Variation Factors Based on a Centered Moving Average • Xc = centered moving average • m = number of elements in the centered moving average. • Xc = --X--2------1 X-----2----+-----X----3----+-----X-.--.-M--.--x--M--m X---------m------2 1---- m • SV = Seasonal variation factor. • xi = value of the ith data point. • i = centered moving average of the ith data point. • SV = X----i Xi Gompertz Curve Trend Analysis • y = ca(bx) • where x, y, a, b, and c are positive. • b = SS-----32----------SS-----21- 1n-- Dt = St + -(--1----α------a----)Tt 155