One common stat that is used is "1 in 5 women are SA'd in college". Assuming a 4-year college, that means 1-((1-.2)^.25) = 5.5% of women in college are SA'd eac

One common stat that is used is "1 in 5 women are SA'd in college". Assuming a 4-year college, that means 1-((1-.2)^.25) = 5.5% of women in college are SA'd each year. So the rates are somewhat similar to a rough approximation with some coarse assumptions about demographics.