test for first order stochastic dominance

[Pedram Sendi <psendi@swissonline.ch>]

Dear all,

Does anybody know whether there is a way to test for first order 
stochastic dominance in s-plus?
I have two distributions and I would like to test whether first order 
stochastic dominance is present. Of course, this can be done graphically 
by checking whether the cumulative distributions cross eachother, but I 
would be interested in a formal test to evaluate this.
Many thanks for your help!

Pedram