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Re: How to calculate 3SIGMA in Linfit! [message #80373 is a reply to message #80365]

Mon, 11 June 2012 09:25

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Monday, June 11, 2012 3:51:50 AM UTC-4, dave poreh wrote:
> Dear folks
> hi,
> i want to calculate 3sigma in linfit function. sigma function just give me the SD and i could not do 3*sigma to get 3sigma. As far as i understood first i need to transfer data to normal function and then i find SD and 3SD=3sigma.

I'm assuming you want to calculate a 3 sigma confidence limit. But of what? The slope coefficient? Offset coefficient?

As far as I understand, 3 sigma is indeed usually 3 times the 1 sigma error estimate. When your fitting function is non-linear it gets more complicated, but yours is not-nonlinear.

Craig

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[Message index]

		Re: How to calculate 3SIGMA in Linfit! By: Craig Markwardt on Tue, 12 June 2012 12:35
		Re: How to calculate 3SIGMA in Linfit! By: d.poreh on Tue, 12 June 2012 11:10
		Re: How to calculate 3SIGMA in Linfit! By: Craig Markwardt on Tue, 12 June 2012 10:54
		Re: How to calculate 3SIGMA in Linfit! By: Craig Markwardt on Tue, 12 June 2012 07:53
		Re: How to calculate 3SIGMA in Linfit! By: d.poreh on Tue, 12 June 2012 00:07
		Re: How to calculate 3SIGMA in Linfit! By: Craig Markwardt on Mon, 11 June 2012 09:25

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