Is a Polynomial regression in Excel the same as a Quadratic regression? Thanks.?

Question

Is a Polynomial regression in Excel the same as a Quadratic regression? If so, how many 'Orders' do I use? Thanks.

Answer 1

It can be the same.
Quadratic regression = 2nd order polynomial regression. Therefore use a polynomial regression with 2 'orders'.
A 1st order polynomial is linear (the graph is a straight line), a 2nd order polynomial is quadratic (1 reflex point - like an arc), a 3rd order polynomial is cubic (2 reflex points- like an "S").

Answer 2

Quadratic is more restrictive than polynomial.

You speak, of quadratic regression if you have y = kx^2 The dependent variable y is a function which is in square of X

In polynomial the regression takes the form of a polynomial degree higher than 2

ex : y = a x^4 + bx^3 +,,,, is a polynomial regression order 4

Answer 3

No, polynomila regression adjusts a polynomial to a set of data. You chopse the degree of the polynomial. You mean that Excel function availabel in chats, right?

Answer 4

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