Page 500 - F2 - MA Integrated Workbook STUDENT 2018-19
P. 500
Chapter 18
Example 6
Calculate the seasonal variation for the following set of data using the additive
model.
Seasonal
Month Value Trend
variation
Jan 12
Feb 26 19 26 – 19 = +7
Mar 19 20 19 – 20 = –1
Apr 15 21 15 – 21 = –6
May 29 22 29 – 22 = +7
Jun 22 23 22 – 23 = –1
Jul 18 24 18 – 24 = –6
Aug 32 25 32 – 25 = +7
Sept 25
492
