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Writing Basic DATA Steps 185
How SAS Processes Programs 186
Compilation Phase 187
Input Buffer 187
Program Data Vector 187
Syntax Checking 187
Data Set Variables 187
Descriptor Portion of the SAS Data Set 188
Summary of the Compilation Phase 189
Execution Phase 190
Initializing Variables 191
Input Data 192
Input Pointer 192
End of the DATA Step 194
Iterations of the DATA Step 196
End-of-File Marker 199
Summary of the Execution Phase 200
End of the Execution Phase 201
Debugging a DATA Step 201
Diagnosing Errors in the Compilation Phase 201
Diagnosing Errors in the Execution Phase 202
Validating and Cleaning Data 205
Cleaning the Data 208
Testing Your Programs ...
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