Fw: TWOSTEP how to get AIC/BIC for each number of clusters asked for.
The Information Criteria
table (BIC or AIC values for each cluster solution in the autoclustering
range) was omitted from the Model Viewer in Statistics 18. A feature request
has been filed to add it to the viewer. You can still get the Information
Criteria in a pivot table ("Auto-Clustering") in Statistics 18
by running TwoStep from a syntax command and including the subcommand:
You can paste the choices from the TwoStep
dialogs to a syntax window by clicking the Paste button, then add the /PRINT
subcommand in the syntax window.
A couple of points should be made
regarding the TwoStep process:
The first step in the TwoStep process
is to place all cases in a Cluster Feature tree. In Step 2. agglomerative
hierarchical clustering is applied to the terminal, or leaf, nodes of that
tree. You can find the algorithm in the Help->Algorithms meno of Statistics
or in chapter form in the SPSS Statistics 17.0 Algorithms guide. The guide
can be found on the Support web site at http://support.spss.com.
From the "My Product View" menu, choose Statistics, then Documentation.
From the "Statistics Documentation" page, choose "Statistical
Analysis Documentation" and then the Algorithms link. Scroll down
to the TwoStep Cluster chapter.
All of the the cluster methods available
in Statistics - TwoStep, hierarchical (CLUSTER command) and K-Means (QUICK
CLUSTER command) - are sensitive to case order and should be run on randomly-sorted
SPSS, an IBM company
number: 87760 Created on: Jan 19 2010 Last
Reviewed on: Jan 19 2010
Problem Subject: TWOSTEP CLUSTER Model Viewer does not include
values of selected information criterion vs. number of clusters
I'm using the TWOSTEP CLUSTER procedure in Release 18. The output
in the new Model Viewer does not include the listing of information criterion
values for a given number of clusters that is given in the Auto-Clustering
table. I don't see a way to request this table in the dialog boxes. I'm
able to obtain this table by using command syntax and adding
to my TWOSTEP CLUSTER command, but when I do so, I get the warning:
The Print subcommand of the TwoStep Cluster procedure has been deprecated
and will be removed in the next release. Use the Model Viewer to view descriptive
information about the clusters. See the online help for information about
the Model Viewer.
I need the information in this table. Can it be added to the output given
in the Model Viewer?
Resolution Subject: Enhancement
An enhancement request has been submitted to SPSS Development, requesting
that the information in the Auto-Clustering table be incorporated into
the new Model Viewer output.
----- Forwarded by David
Matheson/Chicago/IBM on 05/18/2010 10:10 AM -----
TWOSTEP does a hierarchical clustering on a subset of
the cases and then applies that to all of the cases.
If I recall correctly TWOSTEP used to show the AIC/BIC for each cluster
number down from the max asked for. E.g., if I asked for a max of 5 clusters
it would give the AIC or BIC for 5 down to 1 cluster 5,4,3,2,1.
I haven't used TWOSTEP previously with the latest version but cannot seem
to find that in the output? Was it removed? Is there now a way to
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