The following question will ask you to provide a line of missing code. The following program is submitted to output observations from data set ONE that have more than one record per patient proc sort data=one out=two; by subjid; run; data two; set two; <insert code here> if (first.subjid ne 1 or last.subjid ne 1)then output; run; In the space below, enter the line of code that will correctly complete the program (Case is ignored. Do not add leading or trailing spaces to your answer.). Ans: BYSUBJID; (should be the answer. But in testing engines for SAS certification site, it gives you the wrong answer when BYSUBJID is given. The correct answer says BYSUBJID;BYSUBJID; What is the reason?)
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