title: Computing Compounded Return in SAS
body: <p>I have a dataset of date(monthly), person and return(monthly). I need to calculate the compounded monthly return of the dataset from April Year t to March Year t+1 for each person. 
  For example,</p>
  
  <p>Annual return Person A= April Year 1* May Year 1*......*March Year 2.</p>
  
  <p>Can I know how can I do that in SAS? Do I need an array?</p>