An informative review of last years great homeschooling study by NHERI's Dr. Ray:
"This is the latest of a long line of nearly identical studies Ray has been performing for decades now at fairly even intervals. In two previous posts I reviewed this large body of work, which you can read here and here. This new study tries very hard to overcome one of the most persistent deficiencies of his previous work (and the 1999 Rudner study)–the near exclusive reliance on HSLDA’s advertisement to recruit subjects, leading to unrepresentative samples. This time around Ray tried to recruit families from outside of the HSLDA orbit. Did he succeed?" Continued here.