<P> An operator which computes certain statistical values for the <I>TheInputConcept</I>. 
  The computed values appear in a <TT>ColumnSet</TT> which contains exactly one 
  row with the statistical values, and which belongs to <I>TheOutputConcept</I>. 
<P> The sum of all values in an attribute can be computed by specifying a <TT>BaseAttribute</TT> 
  with the parameter <I>AttributesComputeSum</I>. There can be more such attributes; 
  the sum is computed for each. <I>TheOutputConcept</I> must contain a <TT>BaseAttribute</TT> 
  for each sum which is computed; their names must be those of the input attributes, 
  followed by the suffix <TT>&quot;_SUM</TT>&quot;. 
<P> The total number of entries in an attribute can be computed by specifying 
  a <TT>BaseAttribute</TT> with the parameter <I>AttributesComputeCount</I>. There 
  can be more such attributes; the number of entries is computed for each. <I>TheOutputConcept</I> 
  must contain a <TT>BaseAttribute</TT> for each count which is computed; their 
  names must be those of the input attributes, followed by the suffix &quot;<TT>_COUNT</TT>&quot;. 
<P> The number of unique values in an attribute can be computed by specifying 
  a <TT>BaseAttribute</TT> with the parameter <I>AttributesComputeUnique</I>. 
  There can be more such attributes; the number of unique values is computed for 
  each. <I>TheOutputConcept</I> must contain a <TT>BaseAttribute</TT> for each 
  number of unique values which is computed; their names must be those of the 
  input attributes, followed by the suffix &quot;<TT>_UNIQUE</TT>&quot;. 
<P> Further, for a <TT>BaseAttribute</TT> specified with <I>AttributesComputeDistrib</I>, 
  the distribution of its values is computed. For example, if a <TT>BaseAttribute</TT> 
  contains the values 2, 4 and 6, three output <TT>BaseAttribute</TT>s will contain 
  the number of entries in the input where the value was 2, 4 and 6, respectively. 
  For each <TT>BaseAttribute</TT> whose value distribution is to be computed, 
  the possible values must be given with the parameter <I>DistribValues</I>. One 
  entry in this parameter is a comma-separated string containing the different 
  values; in the example, the string would be &quot;<TT>2,4,6</TT>&quot;. Thus, 
  the number of entries in <I>AttributesComputeDistrib</I> and <I>DistribValues</I> 
  must be equal. <I>TheOutputConcept</I> must contain the corresponding number 
  of <TT>BaseAttributes</TT> (three in the example); their names must be those 
  of the input attributes, followed by the suffix <TT>&quot;_&lt;value&gt;</TT>&quot;. 
  In the example, <I>TheOutputConcept</I> would contain the <TT>BaseAttribute</TT>s 
  &quot;<TT>inputBaName_2</TT>&quot;, &quot; <TT>inputBaName_4</TT>&quot; and 
  &quot;<TT>inputBaName_6</TT>&quot;. <BR>
  <BR>
<P> 
PARAMETERDESCRIPTION
TheInputConcept:inherited
AttributesComputeSum:numeric
AttributesComputeCount:(see
AttributesComputeUnique:&nbsp;
AttributesComputeDistrib:text)
DistribValues:&nbsp;
TheOutputConcept:inherited