Page 278 - F2 - MA Integrated Workbook STUDENT 2018-19

Chapter 12

Multiplicative model:

Using a multiplicative or proportional model, the variations are shown as a
percentage of the trend.

Example 7

Calculate the seasonal variation for the following set of data using the
multiplicative model.

Month Value Trend Seasonal variation

Jan 12

Feb 26 19 7/19 × 100 = +37% or 137%

Mar 19 20 –1/20 × 100 = –5% or 95%

Apr 15 21 –6/21 × 100 = –29% or 71%

May 29 22 7/22 × 100 = + 32% or 132%

Jun 22 23 –1/23 × 100 = –4% or 96%

Jul 18 24 –6/24 × 100 = –25% or 75%

Aug 32 25 7/25 × 100 = +28% or 128%

Sept 25

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