19 Association of Research Libraries Research Library Issues 290 2017 26 Soria, Nackerud, and Peterson, “Socioeconomic Indicators.” 27 Ex Libris Group, Aleph integrated library system [computer software], 2012. 28 Cybrarian Corporation, Cybrarian [computer software], 2013, http:// www.cybrarian.com/. 29 OCLC, QuestionPoint [computer software], 2013. 30 Felix Thoemmes, “Propensity Score Matching in SPSS,” 2012, http:// arxiv.org/ftp/arxiv/papers/1201/1201.6385.pdf. 31 Ibid. 32 Paul R. Rosenbaum and Donald B. Rubin, “Constructing a Control Group Using Multivariate Matched Sampling Methods That Incorporate the Propensity Score,” American Statistician 39, no. 1 (1985): 33–38. 33 Melguizo, Kienzl, and Alfonso, “Comparing the Educational Attainment” Christopher Winship and Stephen L. Morgan, “The Estimation of Causal Effects from Observational Data,” Annual Review of Sociology 25 (August 1999): 659–706. 34 Andy Field, Discovering Statistics Using SPSS, 3rd ed. (Thousand Oaks, California: SAGE, 2009). 35 Krista M. Soria, Jan Fransen, and Shane Nackerud, “Beyond Books: The Extended Academic Benefits of Library Use for First-Year College Students,” College & Research Libraries 78, no. 1 (January 2017): 8–22. 36 Soria, Fransen, and Nackerud, “Library Use and Undergraduate Student Outcomes.” 37 Chiteng Kot and Jones, “The Impact of Library Resource Utilization.” 38 Chiteng Kot and Jones, “The Impact of Library Resource Utilization” Graham Stone and Bryony Ramsden, “Library Impact Data Project: Looking for the Link between Library Usage and Student Attainment,” College & Research Libraries 74, no. 6 (November 2013): 546–559.
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