The Pathways Clearinghouse strives to present a complete set of race and ethnicity data for each study, in accordance with the federal standards for classifying data on race and ethnicity. In practice, for most studies this means that an individual can fall only into single race or ethnicity category. For example, a person would identify as either Hispanic or Black, but not both. Because of this, most studies present race and ethnicity data that sums to 100 percent. In some cases, however, study authors treated race and ethnicity as non-exclusive categories. For example, an individual could self-identify both as Hispanic (ethnicity) and Black (race). In cases where individuals report on race and ethnicity separately, the sum total for race and ethnicity demographics might be greater than 100 percent.