我有两组数据，不是正态分布，需要比较两者是否有显著差异，我用的是下面的比较方法；
>a=c(0.00,0.25,0.00,0.00,0.25,0.00,0.00,0.25,0.25,0.50,0.25,0.00,0.25,1.50,0.00,0.25,0.25,0.00,0.00,0.00,0.25,0.00,0.25,0.25,0.00,0.50,0.25,0.25,0.00,0.25)
>b=c(0.25,0.00,0.25,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.50,0.00,0.00,0.00,0.00,0.50,0.25,0.25,0.00,0.50,0.25)
> wilcox.test(a, b)
W = 573, p-value = 0.03895 有显著差异
但有人说这是单尾，我这种情况需要用双尾，算出来P值大于0.05，他用SPSS算的
请问是我的结果正确还是他正确，谢谢。
