When using arrays in PROC PHREG, you can not use an abbreviated variable list to define the array elements unless every variable implied by the list abbreviation exists in the data set. When referencing the array, if PROC PHREG encounters an implied variable that is not found in the DATA= data set, this error message is issued:

   ERROR: The variable xxx was referenced but not given a value.

where 'xxx' represents the name of the variable.

To circumvent the problem, rewrite the ARRAY statement and any references to the array so that abbreviated variable lists refer only to variables which are actually present in the data set.

Example:

Suppose the DATA= data set contains X variables: X1, X2, X3, and X6. The statements:

   array x{6} x1-x6;        /* array definition */
   do i=1 to 6;
     y=x[i];                /* array reference  */
   end;

result in:

   ERROR: The variable x4 was referenced but not given a value.
   ERROR: The variable x5 was referenced but not given a value.

This ARRAY statement implies the existence of variables X1, X2, X3, X4, X5, and X6. The errors occur since variables X4 and X5 are not in the data set. To avoid the errors, rewrite the ARRAY statement as:

   array x{4} x1-x3 x6;      /* array definition */
   do i=1 to 4;
     y=x[i];                 /* array reference  */
   end;

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