| T O P I C R E V I E W |
| bourricot34 |
Posted - 03/29/2010 : 07:39:54 AM
Dear all,
I am using the non linear fit tool to fit my curve with a Gaussian. The model is y=y0 + (A/(w*sqrt(PI/2)))*exp(-2*((x-xc)/w)^2.
My question is what is w ? Is it the value at 1/eČ or 1/e ?
Many thanks in advance,
PS: I am using Origin 8 SR2.
David
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| 2 L A T E S T R E P L I E S (Newest First) |
| larry_lan |
Posted - 03/29/2010 : 10:35:17 AM
It means "2 sigma" if the curve follows Gaussian distribution. I have updated the sample curve as below. I don't remember we did the update from which build, maybe user can update to SR6 to see the new sample curve.
You can see from derived parameter that: FWHM = 2*sqrt(ln(4))*sigma = 2.3548*sigma = 1.1774*w
Larry |
| HuangZY |
Posted - 03/29/2010 : 08:53:34 AM
It's a value related to "full width at half maximum", see
http://mathworld.wolfram.com/GaussianFunction.html
for the deducing process |
