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getting the "n" in quadratic regression

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Dwyane Wade
Dwyane Wade on 22 Aug 2011
Closed: John D'Errico on 9 Oct 2020
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?
  1 Comment
Oleg Komarov
Oleg Komarov on 22 Aug 2011
The summation for i = 1 to N of a constant c, is N*c. This is a basilar summation property.

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