by Giles and Elliot. However, this method sometimes fails to be replicated in other times and places; for instance, when the method was re-tested to identify Native Americans, the average rate of accuracy dropped from 85% to 33%. Prior information about the individual (e.g. Census data) is also important in allowing the accurate identification of the individual's "race". In a different approach, anthropologist C. Loring Brace said: In association with a NOVA program in 2000 about race, he wrote an essay opposing use of the term. A 2002 study found that about 13% of human craniometric variation existed between regions, while 6% existed between local populations within regions and 81% within local populations. In contrast, the opposite pattern of genetic variation was observed for skin color (which is often used to define race), with 88% of variation between regions. The study concluded that "The apportionment of genetic diversity in skin color is atypical, and cannot be used for purposes of classification." Similarly, a 2009 study found that craniometrics could be used accurately to determine what part of the world someone was from based on their cranium; however, this study also found that there were no abrupt boundaries that separated craniometric variation into distinct racial groups. Another 2009 study showed that American blacks and whites had different skeletal morphologies, and that significant patterning in variation in these traits exists within continents. This suggests that classifying humans into races based on skeletal characteristics would necessitate many different "races" being defined. In 2010, philosopher Neven Sesardic argued that when several traits are analyzed at the same time, forensic anthropologists can classify a person's race with an accuracy of close to 100% based on only skeletal remains. Sesardic's claim has been disputed by philosopher Massimo Pigliucci, who accused Sesardic of "cherry pick[ing] the scientific evidence and reach[ing] conclusions that are contradicted by it." Specifically, Pigliucci argued that Sesardic misrepresented a paper by Ousley et al. (2009), and neglected to mention that they identified differentiation not just between individuals from different races, but also between individuals from different tribes, local environments, and time periods. See also Biological anthropology Clan Cultural identity Environmental racism Epicanthic fold Ethnic nationalism Ethnic stereotype Genetic distance Human skin color Hypatia transracialism controversy Interracial marriage List of contemporary ethnic groups Melanism Multiracial Nationalism Nomen dubium – a scientific name that is of unknown or doubtful application. Pre-Adamite Race and ethnicity in