getting the "n" in quadratic regression

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Dwyane Wade 2011-8-22

关闭： John D'Errico 2020-10-9

How do you get the n manually from the quadratic regression formula:

y=ax^2+b+c

(Σx^2)a + (Σx)b + n c = Σy

(Σx^3)a + (Σx^2)b + (Σx)c = Σxy

(Σx^4)a + (Σx^3)b + (Σx^2)c = Σx^2y

or is n given? if it is, where does it come from?

Oleg Komarov 2011-8-22

The summation for i = 1 to N of a constant c, is N*c. This is a basilar summation property.

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