I obviously have, primarily the FBI's Uniform Crime Reporting (UCR), the Bureau of Justice's National Crime Victimization Survey (NCVS), and the Washington Post's police shootings database. If you compare the police-citizen homicide rate of the latter to the violent crime rate by race/ethnicity of the former, it's quite proportional.
If you're basing your opinion off of highly publicized gruesome videos, I can show you less publicized videos of other races being killed by police too.