curve fitting toolbox F test ?

Is it possible to extract/calculate the F test p-values from the output of a curve fitting toolbox?

[Navya Seelam]

Hi,

What is the function you are using in the curve fitting tool box?

Answer 1

[EK]

I am using linear fit and sigmoid (custom)

Answer 2

[Navya Seelam]

Hi,

You can use fitlm to extract p-values. The summary statistics of the model inlcudes p-value for the F-test on the model.

Please refer this link for more details.

Answer 3

[EK]

Hi Navya

thank you very much for your suggestion. I do not understand how can I apply filtm function to my fitting parameter?

Below is a function I am using generated by fittin toolbox

function [fitresult, gof] = createFit(x, y)

%CREATEFIT(X,Y)

% Create a fit.

%

% Data for 'Sigmoid fit 1' fit:

% X Input : x

% Y Output: y

% Output:

% fitresult : a fit object representing the fit.

% gof : structure with goodness-of fit info.

%% Fit: 'Sigmoid fit 1'.

[xData, yData] = prepareCurveData( x, y );

% Set up fittype and options.

ft = fittype( '1./(1 + exp(-a.*(x-c)))', 'independent', 'x', 'dependent', 'y' );

opts = fitoptions( 'Method', 'NonlinearLeastSquares' );

opts.Display = 'Off';

opts.StartPoint = [0.77548254396942 0.353883903104256];

% Fit model to data.

[fitresult, gof] = fit( xData, yData, ft, opts );

% Plot fit with data.

figure( 'Name', 'Sigmoid fit 1' );