“…For instance, researchers have adapted dyad analysis to eliminate the confounding effect of group size (Hallinan and Teixeira, 1987;Moody, 2001;Quillian and Campbell, 2003;Mouw and Entwisle, 2006); controlled individual-level structural variations, such as shared school activities (Moody, 2001) and school segregation (Mouw and Entwisle, 2006); and used exponential random graph models to take balancing reciprocity into consideration (Goodreau, 2007, Goodreau et al, 2009, Wimmer and Lewis, 2010. Furthermore, separating out the effects of structural constraints has been discussed extensively as a methodological challenge (Cheng and Xie, 2012;Currarini et al, 2010;Feld, 1981;McPherson and Smith-Lovin, 1987;Hallinan and Williams, 1989;McPherson et al, 2001;Moody, 2001;Mayer and Puller, 2008;Quillan and Campbell, 2003;Mouw and Entwisle, 2006;Wimmer and Lewis, 2010;Zeng and Xie, 2008).…”