/** define function f for cohort study **/
start f(A) global (N01, M, N1, R1);
A = t(A);
temp=(N01/(M-A[+])) # (A/N1)-R1; *risk ratio?;
return (temp);
finish;
请大神解释下含义啊,特别是 global (N01, M, N1, R1);
和 A = t(A); t是一个函数吗?
小白求教,详解!