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 Comparing 2 data sets by F-test		  New Topic  Reply to Topic
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Lara Nacht

4 Posts
Posted - 07/26/2021 :  07:37:53 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Dear all,
how does the F-test in Origin work? Which parameters of the data sets does it compare? Is it appropriate to use on any data sets?

YimingChen

1609 Posts
Posted - 07/26/2021 :  09:25:56 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Origin has ANOVA analysis that has F-test to compare multiple datasets (menu Statistics->ANOVA). On your second question, you may go to menu Statistics->Stats Advisor and this tool will help you to find the stats tool to use. See below:



James
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Lara Nacht

4 Posts
Posted - 07/26/2021 :  2:34:59 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thank you.

I would like to know the background of the calculation. Which hypothesis is tested in F-test, that compares datasets?
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YimingChen

1609 Posts
Posted - 07/26/2021 :  4:33:10 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
If you mean F-test in ANOVA, then the null hypothesis is the mean difference among all groups are not significant different.

James
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Lara Nacht

4 Posts
Posted - 07/26/2021 :  6:07:39 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thank you for staying in the discussion.

Generally, if the null hypothesis is correct, means the variances are the same,the datasets are not different.

In the case of comparing models, the two datasets of sum of squares are compared to the degrees of freedom with the dataset of the original model and the dataset of the varied model.
https://www.graphpad.com/guides/prism/latest/curve-fitting/reg_howtheftestworks.htm

But how is it done in the case of "Compare datasets"? We have two different datasets and two sets of variables belonging to the fitted model. Which sum of squares do I compare in this case?
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YimingChen

1609 Posts
Posted - 07/27/2021 :  09:24:37 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
To compare datasets based on same model, you need this app. The page also contains the formula of F-test in such case.
https://www.originlab.com/FileExchange/details.aspx?fid=302

James
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Lara Nacht

4 Posts
Posted - 07/28/2021 :  06:32:23 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thank you! :) That is, what I need.
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