Question

In: Math

Consider the following time series data: Month 1 2 3 4 5 6 7 Value 25...

Consider the following time series data:

Month 1 2 3 4 5 6 7

Value 25 14 19 11 18 22 16

(a) Compute MSE using the most recent value as the forecast for the next period. If required, round your answer to one decimal place. What is the forecast for month 8? If required, round your answer to one decimal place. Do not round intermediate calculation.

(b) Compute MSE using the average of all the data available as the forecast for the next period. If required, round your answer to one decimal place. Do not round intermediate calculation. What is the forecast for month 8? If required, round your answer to one decimal place.

Solutions

Expert Solution

a)

Using the most recent value as the forecast:

Month

Value

Forecast

Error

Absolute Error

Error 2

1

25

2

14

25

-11

11

121

3

19

14

5

5

25

4

11

19

-8

8

64

5

18

11

7

7

49

6

22

18

4

4

16

7

16

22

-6

6

36

Total

311

Hence,

MSE = ∑Error2 / (n-1) = 311/6 = 51.8

Forecast for month 8 = 16

b)

Using the average of all the data available as the forecast for the next period

Month

Value

Forecast

Error

Absolute Error

Error 2

1

25

2

14

25

-11.00

11.00

121.00

3

19

19.50

-0.50

0.50

0.25

4

11

19.33

-8.33

8.33

69.44

5

18

17.25

0.75

0.75

0.56

6

22

17.40

4.60

4.60

21.16

7

16

18.17

-2.17

2.17

4.69

Total

217.11

Hence,

MSE = ∑Error2 / (n-1) = 217.11/6 = 36.2

Forecast for month 8 = Average of all the previous months = 17.86


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