• 1 Marks

QTB – May 2015 – L1 – SA – Q14 – Statistics

Identifying types of variations present in time series data.

Which of the following represents the types of variations in time series analysis?

A. Trend and cyclical variation
B. Irregular and cyclical variation
C. Trend and seasonal variation
D. Cyclical and seasonal variation
E. Seasonal and irregular variations

Answer:
A. Trend and cyclical variation

Explanation:
In time series analysis, variations are typically classified into three main types: trend, seasonal, and irregular. Trend refers to the long-term movement in the data, while cyclical variation is the long-term oscillations that occur around the trend line due to economic conditions. Therefore, option A correctly identifies two of these types.

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