5.Press to obtain B.

6.Press 1 to obtain the effective growth rate (as a decimal).

7.To make a y-estimate, key in the x-value and press .

Example 1: A stock's price in history is listed below. What effective growth rate does this represent? If the stock continues this growth rate, what is the price projected to be at the end of 1982 (year 7)?

 

 

End of

Price

 

 

 

Year

 

 

 

 

 

 

 

 

1976(1)

45

 

 

 

 

1977(2)

51.5

 

 

 

 

1978(3)

53.75

 

 

 

1979(4)

80

 

 

 

 

1980(5)

122.5

 

 

 

1981(6)

210

 

 

 

 

1982(7)

?

 

 

 

 

 

 

 

Keystrokes

Display

 

 

CLEAR

1.00

 

First data pair input.

 

 

 

45

1

 

 

 

 

51.5

2

2.00

 

Second data pair input.

 

 

 

 

53.75

2

3.00

 

Third data pair input.

 

 

 

 

80

2

4.00

 

Fourth data pair input.

 

 

 

 

122.5

2

5.00

 

Fifth data pair input.

 

 

 

 

210

2

6.00

 

Sixth data pair input.

 

 

 

 

 

 

0.95

 

Correlation coefficient (between ln

 

 

 

y and x).

 

 

 

 

1

 

27.34

 

A

 

 

 

0

 

 

 

 

 

 

 

0.31

 

B

 

 

 

 

 

 

1

0.36

 

Effective growth rate.

 

 

 

 

 

7

 

232.35

 

Projected price at end of year 7

 

 

(1982).

 

 

 

For repeated use of this routine, the following HP-12C program will be useful.

KEYSTROKES

DISPLAY

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HP 12C manual 100