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Homeschooling: A comprehensive survey of the research, Robert Kunzman, Milton Gaither Other Education-the journal of educational alternatives 2 (1), 4-59, 2013

"A final consistent finding in the literature on academic achievement is that parental background matters very much in homeschooler achievement. Belfield (2005) found greater variance in SAT scores by family background among homeschoolers than among institutionally-schooled students. Boulter’s (1999) longitudinal sample of 110 students whose parents averaged only 13 years of education found a consistent pattern of gradual decline in achievement scores the longer a child remained homeschooled, a result she attributed to the relatively low levels of parent education in her sample. Medlin’s (1994) study of 36 homeschoolers found a significant relationship between mother’s educational level and child’s achievement score. Kunzman’s (2009a) qualitative study of several Christian homeschooling families found dramatic differences in instructional quality correlated with parent educational background. "