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Asked 28 June 2015
Zohara Rafi
University of Otago
Could someone help me decide the ideal no.of clusters from the pseudo t squared graph in SAS?
In SAS, I ran ACECLUS and Cluster procedure to analyze a data set of 16 morphometric characters of a bird.
CccPsfAndPsTSqPl
ot.jpg
78.1 kB
Morphometrics
Clusters
SAS
Ryan Simmons
PPD
I don't see any obvious errors. So, two notes:
1) Plot the data with scatterplots using the PROC CLUSTER output. See the example in the linked SAS help page. What do the data look like? Can you see distinct clusters in the data?
2) Again, you need to do some exploratory data analysis. I notice you are using the Ward minimum-variance method for determining cluster distance. Note that this method is extremely sensitive to outliers; check your data for skew and outliers that may be driving the results.
http://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer.htm#statug_cluster_sect027.htm
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