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Variable Clustering: proc varclus with SAS

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The proc varclus statement in SAS is used to create clusters of variables that are correlated with each others and dis-correlated with other clusters.

Here is the link of the explanation: https://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer.htm#statug_varclus_sect004.htm

The clustering could be done using the following parameter:

"PROPORTION= specifies the minimum proportion of variance explained by a cluster component"

My question is: how do they calculate proportion of variance explained by a cluster component?

Thank you in advance :)

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