Proc cluster outtree creates more observations than original input

[JBHUI]

Hello - I am running a proc cluster procedure.  My data is unique based on an AppID and nonmissing, and I am specifying the outtree option with the ID = AppID.  However, the output dataset is almost double the size of my original input dataset.  I noticed in the output dataset, there are new observations created for the cluster number, where the AppID is a missing value.  I could not find any documentation that explains what is happening.  Could you please help explain this?  I would like to use proc tree to prune the clusters and this is causing errors.  Thanks.

[Reeza]

This is correct based on how it provides data - each cluster gets a line. 

Are you running into issues with the TREE procedure or something else?

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@JBHUI wrote:

Hello - I am running a proc cluster procedure.  My data is unique based on an AppID and nonmissing, and I am specifying the outtree option with the ID = AppID.  However, the output dataset is almost double the size of my original input dataset.  I noticed in the output dataset, there are new observations created for the cluster number, where the AppID is a missing value.  I could not find any documentation that explains what is happening.  Could you please help explain this?  I would like to use proc tree to prune the clusters and this is causing errors.  Thanks.

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[JBHUI]

Thanks Reeza.  Sorry for not thanking you sooner...I guess I am a little confused by the output in the outtree option.  Suppose I have 75 observations in my original dataset "dset" below.  Outtree produces a tree dataset with 149 observations which contains the original 75 plus additional observations for the cluster that begin with a "CL".  Based on the output of the cluster procedure, I would like to limit my data to 5 clusters, and I would like to assign the original 75 observations a value of 1 to 5 that represent the 5 clusters.  How would I go about doing this?  Thank you so much.

proc cluster data = dset method = ward ccc outtree = tree; 
    id AppID;
    var  x1 x2 x3 x4;
run;