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Sample: balance data: what should I put as *class* when sample size per class?

AlvaAlva Member Posts: 1 Newbie
edited September 2020 in Help
Hello everyone! 


I have a problem with the balance data in the operator sample. When I have to sample size per class what should I put for class? I have one variable that I have set to 'label' and that is the variable I want to balance the data on. 

The error when I try for example class='label' or the name of the class (in my case 'species') and the size='50' is:
Message: Calculation of covariance matrices not possible for data sets with zero rows.

Thanks!

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