Confidence interval in fit

By default, the fit function in matlab returns 95 % confidence interval bounds. I want it to return error as defined by 1 sigma confidence, which i think corresponds to 68.27% confidence bound. How do i get this?

Answer 1

[Torsten]

Call "confint" (for the parameters) or "predint" (for the fit) from the command line with the wanted confidence level:

https://uk.mathworks.com/help/curvefit/cfit.confint.html

https://uk.mathworks.com/help/curvefit/cfit.predint.html

This page might also be helpful:

https://uk.mathworks.com/help/curvefit/confidence-and-prediction-bounds.html

Answer 2

[Steven Lord]

Use the confint function on the object returned by fit.