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R Library: Contrast Coding Systems for categorical variables, says we can use orthogonal polynomial for ordered factor encoding which the levels are equally spaced.

I do not understand why (mathematically) and intuition behind it. Could anyone explain it to me?

Does polynomial encoding have any relationship with polynomial regression?

ttnphns
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Haitao Du
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  • It's saying it can be used for *equally spaced* ordinal variables like income and education. So basically for discretised continuous variable, so yes same as polynomial regression but with discretised data as factors – seanv507 Nov 09 '16 at 21:45

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