Programming the statistical procedures from SAS

Subtracting Within STD from Total STD in PROC FASTCLUS output?

Reply
New Contributor
Posts: 4

Subtracting Within STD from Total STD in PROC FASTCLUS output?

Hello,

This pertains to the output data from PROC FASTCLUS. This may sound very ignorant, but I'm wondering if you get a measure of separation between clusters (a kind of "Between STD") when you subtract Within STD from Total STD?  I would then be interested in the ratio between this "Between STD" vs Within STD.  If not, should R^2 ratio be preferred as a measure of separation of clusters vs within cluster variation?

Thank you!

SAS Super FREQ
Posts: 3,305

Re: Subtracting Within STD from Total STD in PROC FASTCLUS output?

The VariableStat table contains a column labeled RSQ/(1 - RSQ). The documentation says that that ratio is "the ratio of between-cluster variance to within-cluster variance." Is that what you are looking for?

I don't think what you suggest would be true (but I don't fully understand what you are proposing). In my experience, it is usually the VARIANCE (not the STD) that you try to decompose into interpretable independent components.

Ask a Question
Discussion stats
  • 1 reply
  • 201 views
  • 0 likes
  • 2 in conversation