According to official FBI crime statistics, Rice University had the highest per capita crime rate of ALL universities and colleges in the state of Texas in 2015:
http://www.chron.com/news/houston-texas/texas/article/The-safest-and-most-dangerous-college-campuses-in-9967911.php#photo-10105566
Rice has a smaller percentage of both blacks and women than Vanderbilt.
Only about 72% of Rice undergrads live on campus, compared to 90% at Vandy.
Only about 50% of Rice undergrads are from out of state, compared to 90% OOS at Vandy.
Vandy has approx. 3000 more undergrad students than Rice, which is a lot more people to interact with.
Of course the big elephant in the room for Rice for many years, is the question of why they have such a small percentage of OOS students compared with most other elite private U’s. Does the admissions office intentionally favor Texas applicants, or does Rice just have a problem attracting top OOS students?