Time Series Analysis - STS 201/STS Dept

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What is the purpose of dividing each quarterly moving total by 4 in column 4?

To compute the moving averages for all quarters

To determine the four-quarter moving total (correct)

To find the centered moving average in column 6

To calculate the specific seasonal for each quarter

How is the specific seasonal for each quarter computed?

By dividing the sales in column 3 by the centered moving average in column 6 (correct)

By multiplying the sales in column 3 with the centered moving average in column 6

By finding the average of all the sales in column 3

By subtracting the sales in column 3 from the centered moving average in column 6

What does the specific seasonal value represent?

The sum of all sales in a quarter

The ratio of the original time series value to the moving average (correct)

The average of all moving averages

The difference between the actual sales and the moving average

How is the first centered moving average calculated?

(8.500 + 8.450) / 2 Signup and view all the answers

What is the purpose of the moving-average method in time series analysis?

To measure the seasonal fluctuation and smooth the trend Signup and view all the answers

Where are centered moving averages positioned according to the text?

On a particular quarter Signup and view all the answers

What is a disadvantage of the moving-average method in time series analysis?

It generates cycles or movements not present in the original data Signup and view all the answers

When applying the moving-average method to a time series, what kind of data pattern should be present?

A definite rhythmic pattern of fluctuations Signup and view all the answers

In time series analysis, what does the least squares method do?

Expresses the trend in terms of a mathematical equation Signup and view all the answers

Which computation method involves 'moving' arithmetic mean values through a time series?

Moving-average method Signup and view all the answers

What effect does applying the moving-average method have on data at the beginning and end of a time series?

Data at the beginning and end are lost Signup and view all the answers

What is a time series?

A set of quantitative observations collected over a period of time Signup and view all the answers

Which of the following is an example of time series data?

Average scores in STS 201 for the past 10 years Signup and view all the answers

What is meant by secular trend or regular variation in a time series?

General direction of a time series over a long period of time Signup and view all the answers

Which component of a time series represents the long-term movement of the data?

Trend Signup and view all the answers

What are some factors that may contribute to variations in a time series?

Social, economic, climatic, psychological, or accidental factors Signup and view all the answers

If a time series has an increasing long-term movement, what type of trend does it exhibit?

Upward trend Signup and view all the answers

How is the three-period moving average calculated?

By finding the average of the 1st, 2nd, and 3rd numbers Signup and view all the answers

What is the process to calculate the five-period moving average?

Summing the first 5 numbers and dividing by 5 to find the average Signup and view all the answers

What is a challenge when calculating even-numbered moving averages?

Centering the moving totals with no central time period Signup and view all the answers

What does the process of 'exhausting the numbers' refer to in moving average calculations?

Using all available data points to calculate a single average Signup and view all the answers

In a three-period moving average, what numbers are used for calculating the second moving average?

2nd, 3rd, and 4th numbers Signup and view all the answers

What is the primary difference between three-period and five-period moving averages in terms of calculation process?

Three-period averages consider fewer data points than five-period averages Signup and view all the answers

What is the four-quarter moving average for sales in the year 2017?

$9.463 million Signup and view all the answers

In which season of 2019 did the sales reach their highest point?

Summer Signup and view all the answers

What was the specific seasonal value for Fall in 2018?

0.801 Signup and view all the answers

What was the total sales amount during Spring and Summer of 2017?

$29.7 million Signup and view all the answers

What was the centered moving average for sales in Winter of 2016?

$8.450 million Signup and view all the answers

Which year had the highest total sales amount among 2016, 2017, 2018, and 2019?

2019 Signup and view all the answers

Time Series Analysis - STS 201/STS Dept - Dr. A.A.Akintunde

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