I use the following code but failed. ########################### x=[1,2,3,4,5] y=[2,3,4,5,6] x=r(x) y=r(y) r.t_test(x,y,alternative="less") ########################### It returns that error:object 48 not found But it works if I didn't use alternative. r.t_test(x,y) will return the result of two side test.
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