On analyzing your time series data you suspect that the data represented as y1, y2, y3, … , yn-1, yn may have a trend component that is quadratic in nature. Which pattern of data will indicate that the trend in the time series data is quadratic in nature?
A. (y3-y2) – (y2-y1) = ………= (yn-yn-1)-(yn-1-yn-2)
B. (y2-y1) = (y3-y2) = ……. = (yn-yn-1)
C. ((y2-y1) /y1 ) * 100% = …….((yn-yn-1)/yn-1) * 100%
D. (y4-y2) – (y3-y1) = ………= (yn-yn-2)-(yn-1-yn-3)
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