In 2011, OddCrime's database recorded 460 news items about murder-suicide events. The Violence Policy Center's (VPC) determined that there were 313 murder-suicide events for the first half of 2011. The disparity is primarily due to the fact that multiple stories were written about the same event.
Even with acknowledging the skewing effect of not calculating frequency, OddCrimes still correlates with most other studies within the same domain. Consider the following chart of OddCrimes data: