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Statistical techniques
5.5 Additive model
Month Actual Sales Trend Seasonal variation
Jan 74
Feb 100 89 11
Mar 93 93 0
Apr 86 97 –11
May 112 101 11
Jun 105 105 0
Jul 98 109 –11
Aug 124 113 11
Sept 117 117 0
Oct 110 121 –11
Nov 136 125 11
Dec 129
Extrapolate trend and then apply the appropriate variation
203
