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 Statistical comparison of two exponents		  New Topic  Reply to Topic
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joseadangelo

3 Posts
Posted - 11/06/2021 :  12:32:49 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin pro 9.0:

https://my.originlab.com/ftp/forum_and_kbase/Images/IR%20vs%20Diameter%20-%20N%20ovata--.opj

Hi

I used allometric functions (y = a xb) to fit two datasets (named “Distal” -in blue- and “Proximal” -in red-; please see the uploaded file).
I obtained two equations:

y (distal) = 2.20 x -0.21

y (prox.) = 2.40 x -0.12

I need to determine whether or not the two exponents (parameters b; -0.21 and -0.12) are significantly (statistically) different.

How can I do that?
Thanks in advance.
Kind regards,
Jose

easwar

USA
1964 Posts
Posted - 11/06/2021 :  1:41:44 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hello Jose,

In the Analysis->Fitting menu, there is a tool named Compare Datasets, but this is limited to comparing the overall fit from the two models and does not compare a specific parameter.

We have this free App:
https://www.originlab.com/fileExchange/details.aspx?fid=501
This lets you check if the value of the parameter is statistically different from a specified value.
So you can run the test on one of your datasets, and plug in the b value from the fit result of the other dataset, to compare.

This app needs version 9.6 or higher. You can download our demo version and try the App.

Hope this helps.

Easwar
OriginLab
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joseadangelo

3 Posts
Posted - 11/12/2021 :  6:11:52 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Easwar!

Thank you very much for your help.
Kind regards.
Jose
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Sam Fang

293 Posts
Posted - 11/18/2021 :  9:32:46 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Jose,

We have another app: Compare Datasets
https://www.originlab.com/fileExchange/details.aspx?fid=302

It can determine whether a parameter in two datasets is different or not.

In the app, choose Compare: Parameters.

Thanks.
Sam

Sam
OriginLab Technical Services
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joseadangelo

3 Posts
Posted - 11/19/2021 :  09:31:02 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Sam

Great to know that!!
Thanks a lot.
Kind regards

Jose
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