| T O P I C R E V I E W |
| kmgraju |
Posted - 07/23/2015 : 02:46:57 AM
Dear members,
I have an experimentally measured data points(y) for the variable x. These data points are random data and collected from more than 100 samples. I have plotted these points in a graph (x,y) and find the correlation between them. It was non-linear second order polynomial.
I have a cut-off value in the experimentally measured data points. I want to do uncertainty analysis or in other words I want to find out the uncertainty range in the variable x using the cut-off value.
What is the best statistical method could be adopted to find out the uncertainty range
Thank you for your time
Thank you
kmgraju
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| 6 L A T E S T R E P L I E S (Newest First) |
| kmgraju |
Posted - 10/31/2015 : 03:17:59 AM
Hi,
Is there any update about Bootstrap regression
Thank you
Govind |
| SeanMao |
Posted - 07/27/2015 : 01:49:41 AM
Hi,
Currently we do not support computing confidence intervals using bootstrapping regression.
Regards!
Sean
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| kmgraju |
Posted - 07/23/2015 : 11:11:48 PM
Thank you for your reply.
from my experimental samples for the same x value I am getting a different y value. But I have a set point or cutoff point in my Y variable. I would like to find out the range in the variable x where the uncertainty takes place by using the cutoff point.
I would like to know, can I use the method which you have suggested is applicable?
and what is bootstrapping? is this method used to find the confidence interval?
Thank you |
| SeanMao |
Posted - 07/23/2015 : 9:19:07 PM
Hi,
The algorithm in finding the confidence interval in polynomial regression is in page below:
http://www.originlab.com/doc/Origin-Help/PR-Algorithm
Regards!
Sean
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| kmgraju |
Posted - 07/23/2015 : 05:04:46 AM
Thank you for your reply. It is similar like what I expected.
I have few questions
How bootstrapping method is useful to find the uncertainty range in the variable along the x-axis with the cutoff value at the y-axis ?
Is it same as you mentioned earlier?
Thank you
kmgraju
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| SeanMao |
Posted - 07/23/2015 : 03:58:03 AM
Hi,
I am not so sure what you are looking for exactly, but I am guessing you are looking for the Confidence Band (uncertainty range) with self-defined Confidence Level (cutoff) for a second polynomial fitting.
We have a figure in Polynomial Fit section which highlight confidence interval by pink filling in the graph:
http://originlab.com/index.aspx?go=Products/Origin/DataAnalysis/CurveFitting/LinearAndPolynomialFitting#5
If this is what you want, you can make use of our Polynomial Fit tool and set Confidence Level for Parameters(%) in the dialog under Quantities to Compute: Fit Parameters node.
Regards!
Sean
OriginLab Tech. Service |
