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marelizgrav
marelizgrav
Level I

Two-Group Discriminant Analysis - Plot Looks Weird?

Created: May 21, 2022 10:31 AM  |  Last Modified: Jun 8, 2023 5:49 PM (2189 views)

Hello,

I am trying to perform a two-group discriminant analysis but I think my plot looks funny. It is suspicious to me that all of my samples within each group are horizontally spread across the same Canonical1 variable. Is this normal? Thank you for your help. 

 

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peng_liu
peng_liu
Level VII
Solution

Re: Two-Group Discriminant Analysis - Plot Looks Weird?

Created: May 26, 2022 08:26 AM  |  Last Modified: May 26, 2022 5:27 AM (2130 views)  |  Posted in reply to message from marelizgrav 05-21-2022

This is normal, because you have only two groups. Refer to Canonical Structure , if you have K groups, K-1 canonical variables are obtained. In the situation of two groups, there is just 1 canonical variable. You can see how the coordinates are defined by going to the platform red triangle menu, select Canonical Options > Save Canonical Scores, to save the values to the original data table. In addition, for your example, the two groups are well separable.

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peng_liu
peng_liu
Level VII
Solution

Re: Two-Group Discriminant Analysis - Plot Looks Weird?

Created: May 26, 2022 08:26 AM  |  Last Modified: May 26, 2022 5:27 AM (2131 views)  |  Posted in reply to message from marelizgrav 05-21-2022

This is normal, because you have only two groups. Refer to Canonical Structure , if you have K groups, K-1 canonical variables are obtained. In the situation of two groups, there is just 1 canonical variable. You can see how the coordinates are defined by going to the platform red triangle menu, select Canonical Options > Save Canonical Scores, to save the values to the original data table. In addition, for your example, the two groups are well separable.

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