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Online Tutor的内容大多都要掌握，有些是重点掌握，有的是了解即可。
具体考点：
Accessing Data
Use FORMATTED and LIST input to read raw data files.
Use INFILE statement options to control processing when reading raw data files.
Use various components of an INPUT statement to process raw data files including column and line pointer controls, and trailing @ controls.
Combine SAS data sets.
Access an Excel workbook.
Creating Data Structures
Create temporary and permanent SAS data sets.
Create and manipulate SAS date values.
Export data to create standard and comma-delimited raw data files.
Control which observations and variables in a SAS data set are processed and output.
Managing Data
Investigate SAS data libraries using base SAS utility procedures.
Sort observations in a SAS data set.
Conditionally execute SAS statements.
Use assignment statements in the DATA step.
Modify variable attributes using options and statements in the DATA step.
Accumulate sub-totals and totals using DATA step statements.
Use SAS functions to manipulate character data, numeric data, and SAS date values.
Use SAS functions to convert character data to numeric and vice versa.
Process data using DO LOOPS.
Process data using SAS arrays.
Validate and clean data.
Generating Reports
Generate list reports using the PRINT procedure.
Generate summary reports and frequency tables using base SAS procedures.
Enhance reports through the use of user-defined formats, titles, footnotes and SAS System reporting.
Generate reports using ODS statements.
Handling Errors
Identify and resolve programming logic errors.
Recognize and correct syntax errors.
Examine and resolve data errors.
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