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1. Key in the program and press CLEAR .
2. Divide the data points to be input into 3 equal consecutive groups. Label
them Groups I, II and III for convenience.
3. Key in the first point of group I and press .
4. Key in the first point of group II and press .
5. Key in the first point of group III and press .
6. Repeat steps 3, 4, and 5 for the balance of the data in each group. After
executing step 5 the display shows how many sets of data have been
entered.
7. To fit the data to a Gompertz curve, press 12 . The
resultant display is the curve constant "a". Constants "b" and "c" may be
obtained by pressing 6 and 7 respectively.
8. To calculate a projected value, key in the number of the period and press
.
9. Repeat step 8 for each period desired.
Example: The X-presso Company marked a revolutionary new coffee
brewing machine in 1968. Sales grew at a steady pace for several years,
then began to slow. The sales records for the first 9 years of the product's
life were as follows.
What are the projected sales volumes for this product in its 10th and 12th
year?What is the maximum yearly sales volume for this product if the
PV: Unused PMT: Unused
FV: Unused
R
0
: Unused
R
1
: S
1
R
2
: S
2
R
3
: S
3
R
4
: n
R
5
: a R
6
: b
R
7
: c R
8
-R
.0
: Unused
Year Sales($K)
118
241
349
4 151
5 188
6 260
7 282
8 322
9 340