User Manual

b. Key in 2nd quarter sales and press 2.
c. Key in 3rd quarter sales and press
3.
d. Key in 4th quarter sales and press
4.
e. Key in the 1st quarter sales for the next year and press
5.
4. Press
00 to calculate the centered moving average for the 3rd quarter of
the first year.
5. Press
to calculate the seasonal variation for this quarter.
6. Key in the next quarter's sales and press
to calculate the moving average for the
next quarter.
7. Press
to calculate the seasonal variation.
8. Repeat steps 6 and 7 for the balance of the data.
Example: Econo-Wise Home Appliance Company had quarterly sales for the
years 1978 thru 1980 as follows:
Sales (IN $K)
Quarterly 1st 2nd 3rd 4th
1978 397 376 460 501
1979 455 390 530 560
1980 513 434 562 593
Find the centered 4-quarter moving average and seasonal variation factor for
each quarter.
Keystrokes Display
CLEAR
0.00
397 1
397.00
376 2
376.00
460 3
460.00
501 4
501.00
455 5
455.00
00
440.75
Centered 4-element average for 3rd quarter, 1978
seasonal variation factor.
104.37