HP 12C#ABA hp 12c_solutions handbook_English_E.pdf - Page 83
Gompertz Curve Trend Analysis
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3 48-44 48 3 01 48-43, 33 01 n: Unused PV: Unused FV: Unused R1: X1 R3: X3 R5: X5 R7: X7 R9: X9 R.1: X11 R.3: X13 1. Key in the program. REGISTERS i: Unused PMT: Unused R0: n R2: X2 R4: X4 R6: X6 R8: X8 R.0: X10 R.2: X12 2. Press CLEAR . 3. Key in 12 and press 0. 4. Key in the values for the first 13 months, storing them one at a time in registers 1 through .3; i.e. Key in the 1st month and press 1. Key in the 2nd month and press 2, etc., Key in the 10th month and press 0, etc., Key in the 13th month and press 3. 5. Press 00 the 7th month. to calculate the centered moving average for 6. Press to calculate the seasonal variation for that month. 7. Key in the value for the next month (14th) and press to calculate the moving average for the next month (8th). 8. Repeat steps 6 and 7 for the balance of the data. These programs may be customized by the user for different types of centered moving averages. Inspection of the programs will show how they can be modified. Gompertz Curve Trend Analysis 82