/*优效界值为0.6*/
proc ttest data=a alpha=0.05 sides=u h0=0.6;
class group;
var x;
run;
/*非劣效性界值为-0.52*/
proc ttest data=a alpha=0.05 sides=u h0=-0.52;
class group;
var x;
run;

/*sides:*/
/*2：specifies two-sided tests and confidence intervals.*/
/*L：specifies lower one-sided tests (in which the alternative hypothesis indicates a parameter value less than the null value) and lower one-sided confidence intervals between minus infinity and the upper confidence limit.*/
/*U：specifies upper one-sided tests (in which the alternative hypothesis indicates a parameter value greater than the null value) and upper one-sided confidence intervals between the lower confidence limit and infinity.*/
/*By default, SIDES=2.*/