HP 12C Financial Programmable Calculator Manuel d'utilisateur télécharger pdf (Page 84)

A useful curve for evaluating sales trends, etc., is the Gompertz curve.

This is a "growth" curve having a general "S" shape and may be used to

describe series of data where the early rate of growth is small, then

accelerates for a period of time and then slows again as the time grows

long. The sales curve for many products follow this trend during the

introductory, growth and maturity phases.

The data points to be fit to a Gompertz curve should be equally spaced

along the x (or time) axis and all the data points must be positive. The

points are divided serially into 3 groups for data entry.

The following HP 12C program processes the data, fits it to a Gompertz

curve and calculates estimated values for future data points. The 3

constants which characterize the curve are available to the user if desired.

KEYSTROKES DISPLAY

CLEAR

00-

01- 43 23

02-44 40 3

03- 33

04- 43 23

05-44 40 2

06- 33

07- 43 23

08-44 40 1

1 09- 1

10-44 40 4

11- 45 4

12-43, 33 00

13- 45 3

14- 45 2

15- 30

16- 45 2

17- 45 1

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 164 165

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HP 12C Financial Programmable Calculator Manuel d'utilisateur Page 84