Dear Mr. KurtBremser, Thank you for your advise, I have a mistake with the LIBNAME code. I have fixed and run again with an option but still nothing happened. However, I have read Maxims of Maximally Efficient SAS Programmers, Maxim 19 and I think it very useful for me as a beginner. I want to know more detail about your solution, I have understood your idea but the data that I have imported not only have problem with the variable name but also the missing data. Hope you show me more.
... View more