HP 12C manual Pricing Calculations, Forecast of next period expected usage, 157

3n

S		=	∑	Iny		= n lnc + b	2n + 1	( lna)	bn	– 1
	3				i				--------------
									b	– 1

i = 2n + 1

• Smoothed average St = αXt + (1 - α)St - 1

• Change, Ct = St - St - 1

• Trend, Tt = αCt + (1 - α)Tt - 1

•

Current period expected usage,

•

Forecast of next period expected usage,

• Error, et = t - Xt

•

Cumulative error = ∑e2t

t = 1

•

Initial conditions: St-1= Xt-1Tt-1= 0

Pricing Calculations

Markup and Margin Calculations

•Ma = margin(%).

•Mu = markup(%).

•S = selling price.

•C = cost.

157