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We use this technique to analyze racial patterns in friendship networks in a set of American high schools from the Add Health dataset. Biases in preferences and biases in meeting rates are both highly significant in these data, and both types of biases differ significantly across races. Asians and Blacks are biased toward interacting with their own race at rates &gt;7 times higher than Whites, whereas Hispanics exhibit an intermediate bias in meeting opportunities. Asians exhibit the least preference bias, valuing friendships with other types 90% as much as friendships with Asians, whereas Blacks and Hispanics value friendships with other types 55% and 65% as much as same-type friendships, respectively, and Whites fall in between, valuing other-type friendships 75% as much as friendships with Whites. Meetings are significantly more biased in large schools (&gt;1,000 students) than in small schools (&lt;1,000 students), and biases in preferences exhibit some significant variation with the median household income levels in the counties surrounding the schools.<\/jats:p>","DOI":"10.1073\/pnas.0911793107","type":"journal-article","created":{"date-parts":[[2010,3,9]],"date-time":"2010-03-09T00:29:02Z","timestamp":1268094542000},"page":"4857-4861","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":243,"title":["Identifying the roles of race-based choice and chance in high school friendship network formation"],"prefix":"10.1073","volume":"107","author":[{"given":"Sergio","family":"Currarini","sequence":"first","affiliation":[{"name":"Dipartimento di Scienze Economiche, Universit\u00e0 Ca\u2032 Foscari di Venezia, and School for Advanced Studies in Venice, 30123 Venice, Italy;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew O.","family":"Jackson","sequence":"additional","affiliation":[{"name":"Department of Economics, Stanford University, Stanford, CA 94305;"},{"name":"Santa Fe Institute, Santa Fe, NM 87501; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paolo","family":"Pin","sequence":"additional","affiliation":[{"name":"Dipartimento di Economia Politica, Universit\u00e0 degli Studi di Siena, 53100 Siena, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"341","published-online":{"date-parts":[[2010,3,8]]},"reference":[{"key":"e_1_3_3_1_2","doi-asserted-by":"publisher","DOI":"10.1086\/338954"},{"key":"e_1_3_3_2_2","article-title":"Racial identity and education","author":"Patacchini E","year":"2006","unstructured":"E Patacchini, Y Zenou, Racial identity and education. 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