Changing the confidence Interval

Is there a way to change the confidence interval from 95% to say 67% and recalculate the coefficients (with the 95% confidence bounds)? I am using the curve fitting tool for my dataset.

[Matt J]

Which curve fitting tool?

[Lizan]

The MATLAB have a app called "Curve Fitting Tool". By default, the confidence level for the bounds is set to 95%. However I want to make the same fitting with a different confidence level. In a previous version this was possible, but I can't find information on how to change this with the latest version.

You can add any type of confidence level in >Tools>Prediction bounds, but that only plot predicted bounds, the P1, p2 values in the linear fit, y = p1*x + p2 are still calculated with 95% of confidence. I would like to do same calculation but not with the default set confidence value.

So basically I am using the function,

% Fit model to data.
[fitresult, gof] = fit( xData, yData, ft, opts );

to fit the data,..

Any ideas?

Answer 1

[Shashank Prasanna]

You can always save the fitted model from CFTOOL : Fit > Save To Workspace and fun the following command: confint(fittedmodel,0.67)

http://www.mathworks.com/help/curvefit/confint.html