 In 1978, Michael Hindelang compared data from the National Crime Victimization Survey (then known as the National Crime Survey, or NCS) to data from the Uniform Crime Reports, both from 1974.He found that NCS data generally agreed with UCR data in regards to the percent of perpetrators of rape, robbery, and assault who were black.For instance, Hindelang's analysis found that both the NCS and UCR estimated that 62% of robbery offenders were black in the United States in 1974.