| T O P I C R E V I E W |
| AKazak |
Posted - 06/01/2022 : 02:28:54 AM
OriginPro 2022b (64-bit) SR1 9.9.5.167
Windows 7 Pro SP1 x64
Greetings!
I discovered that Exp2PMod1 parameters a, b and COD from NLFit are different from those coming from Excel.
Please see the following test project:
https://my.originlab.com/ftp/forum_and_kbase/Images/Exp2PMod1.opju
What do I miss and what fit is the correct one?
Thank you.
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Andrey |
| 3 L A T E S T R E P L I E S (Newest First) |
| AKazak |
Posted - 06/02/2022 : 08:12:03 AM
quote:
Originally posted by AKazak
Interesting question: how do I get the alternative trendlines y=c*exp(b*x) [Exp2PMod1] and y=c*x^b [Allometric1] matching to those produced by Excel?
Any ideas on this?
For me it is important to have a compatibility with the past Excel fitting results.
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Andrey |
| AKazak |
Posted - 06/01/2022 : 10:17:33 AM
Interesting question: how do I get the alternative trendlines y=c*exp(b*x) [Exp2PMod1] and y=c*x^b [Allometric1] matching to those produced by Excel?
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Andrey |
| AKazak |
Posted - 06/01/2022 : 04:28:02 AM
The relevant topics:
https://my.originlab.com/forum/topic.asp?TOPIC_ID=46409
https://my.originlab.com/forum/topic.asp?topic_id=19889
http://www.mikemiddleton.com/Excel-Exponential-Curve-Fit-2010.pdf
It seems to be weird, but Excel still (at least in version 2016) does not fit both y=c*exp(b*x) [Exp2PMod1] and y=c*x^b [Allometric1] to data correctly!
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Andrey |
