Question: Fit a cubic trend function to the data in Example 2. The orthogonal cubic polynomial is Reference Example 2: The simplest and most common use

Fit a cubic trend function to the data in Example 2. The orthogonal cubic polynomial is

Reference Example 2:

The simplest and most common use of trend analysis occurs when the points t0. .. .. .tn ?can be adjusted so that they are evenly spaced and sum to zero. Fit a quadratic trend function to the data

5,3 17 P3(t) = t-7/t. 6 (-2, 3), (-1, 5), (0, 5), (1, 4), and (2, 3)

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