Can you run ANY SUDAAN code without errors? The underscores under DATA means SAS finds the Data = to be incorrect syntax. Which may mean your SUDAAN has an install issue or is not actually SAS callable.   Can you use Proc Records and the Print option to display a few records from the data set?   You might also try adding the library to the data set name. I don't remember if SUDAAN defaults to WORK or not. ... View more