Evidence of OER benefits

David Wiley posted an excellent argument for the benefits of OER in education, including post-secondary or higher education;  see the  2015 Jan. 22 post at http://opencontent.org/blog/archives/3743 .  Based on research data Wiley and colleagues collected (paper has been submitted for review), students have lower drop/withdraw rates, more students pass the classes, and students are able to carry more credits in a semester when Open Educational Resources are used in place of textbooks that must be purchased.