CODEZ

CODEZ (LET)

Let Subcommand

Generate a coded variable based on contiguous values of the response variable.

The CODE command codes the values in a response variable based on the distinct values in the response variable without regard to the order of the values in the response variable.

The CODEZ command is similar to the CODE command. However, the CODEZ command takes the order of the response variable into account. Specifically, CODEZ changes the value of the coded variable whenever the response variable changes value.

The following example shows the difference between the CODE and CODEZ commands.

X	CODE	CODEZ
1	1	1
1	1	1
2	2	2
2	2	2
3	3	3
3	3	3
1	1	4
1	1	4
2	2	5
2	2	5
3	3	6
3	3	6

LET <y> = CODEZ <x>             <SUBSET/EXCEPT/FOR qualification>
where <x> is the response variable;
            <y> is a variable where the coded values are saved;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.

LET Y = CODEZ X
LET Y = CODEZ X SUBSET X > 0

None

None

CODE	= Generate a coded variable based on distinct values.
CODEX	= Generate a coded variable based on contiguous distinct values (but treat zero as special case).
COCODE	= Generate a cocoded variable.

Data Manipulation

2016/06

 
LET X = DATA 1 1 1 2 2 2 3 3 3 1 1 1 1 2 2 3 3 3 3 4
LET Y = CODEZ X
.
SET WRITE DECIMALS 0
PRINT X Y
    

The following results are generated.

------------------------------
              X              Y
------------------------------
              1              1
              1              1
              1              1
              2              2
              2              2
              2              2
              3              3
              3              3
              3              3
              1              4
              1              4
              1              4
              1              4
              2              5
              2              5
              3              6
              3              6
              3              6
              3              6
              4              7