Can someone please explain to me about the contrast statement?
For example, to test the linear/quadratic/cubic trend of a 4-level variable, the contrast statements will be
Linear -3 -1 1 3 Quad 1 -1 -1 1 Cubic -1 3 -3 1.
I just can't get my head around how it is -3 -1 1 3 for linear, 1 -1 -1 1 for quadratic and -1 3 -3 1 for cubic. I only understand they need to sum up to zero.
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ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.