Create the CUSTOMER_RESPONSE data set. CUSTOMER_RESPONSE contains data from a customer survey. Each observation in the data set contains information about factors that influence one respondent's decisions to buy products. A DATA step creates the data set. Using missing values rather than 0s is crucial for calculating frequency counts in PROC TABULATE.

data customer_response;
   input Customer Factor1-Factor4 Source1-Source3
         Quality1-Quality3;
   datalines;
1 . . 1 1 1 1 . 1 . .
2 1 1 . 1 1 1 . 1 1 .
3 . . 1 1 1 1 . . . .

. . . more data lines . . .

119 . . . 1 . . . 1 . .
120 1 1 . 1 . . . . 1 .
;