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An HP-12C program to calculate a centered 12-month moving average
and seasonal variation factor is as follows:
CLEAR
0.00
111.4
1.00
111.17
2.00
111.29
4th quarter average seasonal
variation, %.
KEYSTROKES DISPLAY
CLEAR
00-
1
01- 45 1
2 02-2
03- 10
2
04- 45 2
1
05- 44 1
06- 40
3
07- 45 3
2
08- 44 2
09- 40
4
10- 45 4
3
11- 44 3
12- 40
5
13- 45 5
4
14- 44 4
15- 40
6
16- 45 6
5
17- 44 5
18- 40
7
19- 45 7