Output Data Sets

The VARCLUS Procedure

Output Data Sets

OUTSTAT= Data Set

The OUTSTAT= data set is TYPE=CORR, and it can be used as input to the SCORE procedure or a subsequent run of PROC VARCLUS. The variables it contains are

BY variables
_NCL_, a numeric variable giving the number of clusters
_TYPE_, a character variable indicating the type of statistic the observation contains
_NAME_, a character variable containing a variable name or a cluster name, which is of the form CLUSn where n is the number of the cluster
the variables that are clustered

The values of the _TYPE_ variable are listed in the following table.

Table 68.2: _TYPE_ Value and Statistic

_TYPE_	Contents
MEAN	means
STD	standard deviations
USTD	uncorrected standard deviations, produced when the NOINT option is specified
N	number of observations
CORR	correlations
UCORR	uncorrected correlation matrix, produced when the NOINT option is specified
MEMBERS	number of members in each cluster
VAREXP	variance explained by each cluster
PROPOR	proportion of variance explained by each cluster
GROUP	number of the cluster to which each variable belongs
RSQUARED	squared multiple correlation of each variable with its cluster component
SCORE	standardized scoring coefficients
USCORE	scoring coefficients to be applied without subtracting the mean from the raw variables, produced when the NOINT option is specified
STRUCTUR	cluster structure
CCORR	correlations between cluster components

The observations with _TYPE_='MEAN', 'STD', 'N', and 'CORR' have missing values for the _NCL_ variable. All other values of the _TYPE_ variable are repeated for each cluster solution, with different solutions distinguished by the value of the _NCL_ variable. If you want to specify the OUTSTAT= data set with the SCORE procedure, you can use a DATA step to select observations with the _NCL_ variable missing or equal to the desired number of clusters. Alternatively, you can use a WHERE clause, as follows.

   proc score score=s (where=(_ncl_ =3)) data=newscore;

OUTTREE= Data Set

The OUTTREE= data set contains one observation for each variable clustered plus one observation for each cluster of two or more variables, that is, one observation for each node of the cluster tree. The total number of output observations is between n and 2n-1, where n is the number of variables clustered.

The variables in the OUTTREE= data set are

BY variables, if any
_NAME_, a character variable giving the name of the node. If the node is a cluster, the name is CLUSn where n is the number of the cluster. If the node is a single variable, the variable name is used.
_PARENT_, a character variable giving the value of _NAME_ of the parent of the node
_NCL_, the number of clusters
_VAREXP_, the total variance explained by the clusters at the current level of the tree
_PROPOR_, the total proportion of variance explained by the clusters at the current level of the tree
_MINPRO_, the minimum proportion of variance explained by a cluster component
_MAXEIG_, the maximum second eigenvalue of a cluster

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