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 Exp2PMod1: different results in comparison to Exce		  New Topic  Reply to Topic
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AKazak

Russia
1205 Posts
Posted - 06/01/2022 :  02:28:54 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
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.

---
Andrey
Edited by - AKazak on 06/01/2022 02:29:25 AM

AKazak

Russia
1205 Posts
Posted - 06/01/2022 :  04:28:02 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
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!

---
Andrey
Edited by - AKazak on 06/01/2022 04:29:49 AM
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AKazak

Russia
1205 Posts
Posted - 06/01/2022 :  10:17:33 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
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?

---
Andrey
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AKazak

Russia
1205 Posts
Posted - 06/02/2022 :  08:12:03 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
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.

---
Andrey
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