Written in Ron Cody's signature informal, tutorial style, this book develops and demonstrates data cleaning programs and macros that you can use as written or modify your own special data cleaning needs. You will learn how to find and correct errors in character and numeric values to develop programming techniques related to dates and missing values using the SQL approach to clean up the data to develop techniques to correct the error of your data using integrity constraints and audit trails to prevent errors from which added to a clean data set Beginners and experienced SAS users will find ways to detect and correct data errors while learning how to apply DATA step programming techniques and SAS procedures.