Explain what is so special about polynomials

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It"s only optimal in toy problems for which the answer is known. For real data where you don"t know the true population regression function, it isn"t. Before leaving this section we should ask and answer the following question. What"s so special about polynomials?

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Explain what is so special about polynomials : The true population regression function, it isn"t. Before leaving this section we should ask and answer the following question. What"s so special about polynomials?
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