SUMBY Statement

The COMPUTAB Procedure

SUMBY Statement

SUMBY variables;

The SUMBY statement produces consolidation tables for variables whose names are in the SUMBY list. Only one SUMBY statement can be used.

To use a SUMBY statement, you must use a BY statement. The SUMBY and BY variables must be in the same relative order in both statements, for example:

   by a b c;
   sumby a b;

This SUMBY statement produces tables that consolidate over values of C within levels of B and over values of B within levels of A. Suppose A has values 1,2; B has values 1,2; and C has values 1,2,3. Table 9.1 indicates the consolidation tables produced by the SUMBY statement.

Table 9.1: Consolidation Tables Produced by the SUMBY Statement

SUMBY Consolidations	Consolidated BY Groups
A=1,B=1	C=1	C=2	C=3
A=1,B=2	C=1	C=2	C=3
A=1	B=1,C=1	B=1,C=2	B=1,C=3
	B=2,C=1	B=2,C=2	B=2,C=3
A=2,B=1	C=1	C=2	C=3
A=2,B=2	C=1	C=2	C=3
A=2	B=1,C=1	B=1,C=2	B=1,C=3
	B=2,C=1	B=2,C=2	B=2,C=3

Two consolidation tables for B are produced for each value of A. The first table consolidates the three tables produced for the values of C while B is 1; the second table consolidates the three tables produced for C while B is 2.

Tables are similarly produced for values of A. Nested consolidation tables are produced for B (as described previously) for each value of A. Thus, this SUMBY statement produces a total of six consolidation tables in addition to the tables produced for each BY group.

To produce a table that consolidates the entire data set (the equivalent of using PROC COMPUTAB with neither BY nor SUMBY statements), use the special name _TOTAL_ as the first entry in the SUMBY variable list, for example,

   sumby _total_ a b;

PROC COMPUTAB then produces consolidation tables for SUMBY variables as well as a consolidation table for all observations.

To produce only consolidation tables, use the SUMONLY option in the PROC COMPUTAB statement.

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