April 2024
Intermediate to advanced
824 pages
36h 45m
English
Content preview from Business Statistics
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
Chapter 16 | Time Series and Index Numbers 593
E
1998
can be computed as
E
1998
= (0.8) × X
1998
+ (1 – 0.8) × F
1998
= (0.8) × (136) + (0.2) × (111.04) = 108.8 + 22.208 = 131.008
T
1998
can be computed as
T
1998
= (0.4) × (E
1998
– E
1997
) + (1 – 0.4) T
1997
= (0.4) × (131.008 – 113.6) + (0.6) × (–2.56) = 5.42
Hence, F
1999
= E
1998
+ T
1998
= 131.008 + 5.42 = 136.428
Other forecasted values can be calculated similarly.
16.12.1 Using SPSS for Holt’s Method
Click Analyze/Time Series/Exponential Smoothing. The Exponential Smoothing dialog box will
appear on the screen (Figure 16.32). Place Production in the Variables box. From Model, select
Holt and click ...