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elanor
2 Posts |
 Posted - 02/23/2012 : 11:09:23 AM
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Hi,
I'm making some peak integrations and I need to know the precision of it. In the results "dx" appears, which kind of statistic value is it?
Thanks |
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Hideo Fujii
USA
1582 Posts |
Posted - 02/23/2012 : 2:16:37 PM
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Hi elanor,
I have tried the Integrate Peaks in Peak Analyzer in my Origin 8.6, but I cannot find "dx" in the Integration Result worksheet. Maybe you can clarify how and where you found it as which version of Origin you are using.
--Hideo Fujii
OriginLab |
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easwar
USA
1965 Posts |
Posted - 02/23/2012 : 3:06:26 PM
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Hi Elanor,
If you are using the Integrate Gadget in recent versions, the text on top of the region of interest rectangle (ROI) shows Area and dX, where dX is simply the width of the ROI in x units - has nothing to do with the area. We will improve that and change to FWHM in next version.
This notation with gadget is somewhat misleading as we use dX in other places to mean FWHM. For instance if you use the menu Analysis->Mathematics->Integrate
then the output from that tool reports dX, where dX is FWHM (Full width at half max).
As for your question about precision, the area is computed as described in the algorithm section of this help page:
http://originlab.com/www/helponline/Origin/en/UserGuide/Integrate.html
Easwar
OriginLab |
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elanor
2 Posts |
Posted - 02/28/2012 : 08:04:17 AM
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Thanks for both answers.
I'm using Origin 8.1, and the full output is:
[28.02.2012 14:07:14 "" (2455985.588356)]
integ1
Input
iy = [Book1]Sheet1!(E"Corrected time (s)",A"I")
baseline = 0
type = 0 (math:Mathematical Area)
plot = 0
Output
oy = [Book1]Sheet1!(O"Integrated X3",P"Integrated Y3")
x1 = 15852
x2 = 17249.5
i1 = 31705
i2 = 34500
area = -8853.618447585
y0 = -61.227213844426
x0 = 16050.5
dx = 90.555526901386
So, I'm using "area" as result, but I also need some estimation about the uncertainty of this number.
Thanks ;) |
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Sam Fang
293 Posts |
Posted - 02/29/2012 : 06:18:37 AM
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Here dx is FWHM which Easwar has mentioned.
For integration on given data points, I don't think the uncertainty can be estimated because the trend between two adjacent points is unknown.
However the uncertainty of integration result for a given function can be estimated.
Sam
OriginLab Technical Services |
Edited by - Sam Fang on 02/29/2012 06:20:49 AM |
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Topic |
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Statistics while integrating