0
votes
1answer
31 views

How to interpret coefficients in polynomial regression?

I am working on my thesis (study) about poverty incidence rate and its socio-economic factors using second-order polynomial regression without interaction. The final model in my study is ...
0
votes
0answers
22 views

Parabolic regression with restricted shape

How can I calculate the parabolic regression with vertex at minimum. Is it possible? I have a set of points from which I estimate the parabola using the (I believe) standard equation (from ...
1
vote
2answers
82 views

Is there a way to fit an even function using only odd functions?

I was wondering if there is a way to make an infinite series of odd functions equal to an even function. For example, I would like to know if the next equation is valid ...
1
vote
1answer
123 views

How do I solve the weighted normal equations?

I am trying to solve the normal equations for a 3D LSE of a general quadric: $$ z = ax^2 + bx + cxy + dy^2 + ey + f$$ Write as a vector equation: $$ \vec{z}= \bf{X}\vec{\beta}$$ where the 'ith row ...
2
votes
0answers
191 views

Bare minimum of points in multiple polynomial regression

I have a question on multiple polynomial regression and the absolute minimum amount of points in the different terms. The minimum amount of points required for a second order polynomial would (in one ...
1
vote
0answers
235 views

Fitting a 3d point cloud with a polynomial surface

I have 3D point cloud and I would like to fit a polynomial surface to it. Could anybody please explain the step by step process to that. Thanks a lot.
0
votes
0answers
146 views

How to find the best (integer) polynomial equation?

This is a continuation of How to find curve equation from data? I asked earlier. I am looking for both a formula and the method to find the best (integer) polynomial that fits my data. I still ...
2
votes
0answers
85 views

Polynomial and exponential regression [duplicate]

Possible Duplicate: Determining computational complexity of stochastic processes I have some points $(x_i,y_i)$ generated by a program. These values are not exact, but are random ...
0
votes
0answers
97 views

How do I transform the coefficients of a solved polynomial curve fit?

This all pertains to a piece of software I am writing but figured I'd get a better answer here than in Stackoverflow. I have no problem migrating the question if needed. Disclaimer: I am a software ...
9
votes
4answers
2k views

Polynomial fitting where polynomial must be monotonically increasing

Given a set of monotonically increasing data points (in 2D), I want to fit a polynomial to the data which is monotonically increasing over the domain of the data. If the highest x value is 100, I ...
2
votes
1answer
532 views

Polynomial fitting - how to fit and what is _polynomial fitting_

I don't understand what is polynomial fitting. Can anyone explain me how to fit a curve to given points?