Changing the confidence Interval

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Lizan
Lizan 2012-11-26
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.
  2 个评论
Matt J
Matt J 2012-11-26
Which curve fitting tool?
Lizan
Lizan 2012-11-26
编辑：Lizan 2012-11-26
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?

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回答（1 个）

Shashank Prasanna
Shashank Prasanna 2012-12-14
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

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