Firstly, SAS programming skills(Data manipulation、Statistical procedures、Reporting and Graphing). Secondly, Knowledgement to standard of this industry, that is CDISC. There are multiple books of SAS in clinical trials, you can try: <Modern Approaches to Clinical Trials Using SAS>, <Implementing CDISC Using SAS>, <Clinical Graphs Using SAS>. Thirdly and most importantly, get yourself an internship, you cann't become a real clinical data analyst without doing its work.
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