| T O P I C R E V I E W |
| Karmar |
Posted - 10/20/2021 : 06:02:05 AM
Hi,
How to calculate standard error (SE) for y, where
y = 1/((a/b) + (c/d))
if I know SE of a, b, c, d, and a, b, c, d are obtained from the fitting data to the same equation (z = a*exp(x/b) + c*exp(x/d), dependent error).
Thanks in advance.
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| 5 L A T E S T R E P L I E S (Newest First) |
| YimingChen |
Posted - 10/20/2021 : 4:58:21 PM
I couldn't reproduce your issue. Can you try the attached fitting function? Drag and drop the .fdf file into your Origin Workspace to install. Thank you.
https://my.originlab.com/ftp/forum_and_kbase/Images/deriveTest.zip
James |
| Karmar |
Posted - 10/20/2021 : 3:16:25 PM
Thanks James, I have tried Build Fitting Function, but cannot see the derived parameter (as below).
 
What I am doing wrong? |
| YimingChen |
Posted - 10/20/2021 : 12:39:27 PM
Then you have to calculate manually. Maybe google "Propagation of Uncertain" to find the formula for your case.
James |
| Karmar |
Posted - 10/20/2021 : 09:26:32 AM
Thank you very much James. It is a great feature I didn’t know. I will use it next time, but I have already obtained the parameters from different software, so I cannot use this feature for this data. Is there any other way I can solve the problem in Origin? |
| YimingChen |
Posted - 10/20/2021 : 09:00:13 AM
You may define y as derived parameter in Build Fitting Function dialog. See the page below:
https://www.originlab.com/doc/Origin-Help/Define-DerivPara
James |
