This study of the 2011 administration focused on principal component scores based on the 2008 and 2009 SERU (Student Experience in the Research University) administrations. The first analysis is a traditional nonresponse examination where the response rates of various groups are compared to determine if the responding students represent the larger student body. Table 1 displays response rates for nine demographic distributions including: grade point average, SAT scores, gender, entry from high school or other college, class level, race/ethnicity, area of major (CIP), residency and financial independence. Table 2 presents the results of a test of subgroup differences, analysis of variance, and relies on variance explained to identify important differences. Table 3 displays the difference between the mean of each principal component factor score as computed from the respondents and from a distribution weighted by the proportions in the population. Table 4 addresses the possibility that subgroups of students participated at different rates over the collection period and that some are more or less likely to respond early or late. (Contains 4 tables and 4 footnotes.)