Record: Christian P. Wilkens, Carol H. Wade, Gerhard Sonnert and Philip M. Sadler, “Are Homeschoolers Prepared for College Calculus?” in Journal of School Choice, 9, no. 1 (2015): 30-48. [Abstract]
Summary: Christian P. Wilkens and Carol H. Wade teach in the Department of Education and Human Development, College at Brockport. Gerhard Sonnert and Philip M. Sadler teach in the Science Education Department, Harvard-Smithsonian Center for Astrophysics, Harvard University. As the title implies, the authors investigate the preparation and success of homeschooled students in college calculus.
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A second, fully revised edition of my 2008 book Homeschool: An American History, was published in March of 2017. 
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Homeschooling Research Notes 