Estimates vary wildly.
Some put the number of home-schooled children in the U.S. at about 750,000. Other say it's much higher - closer to 2 million. Va. Still, many questions remain. What may be the most thorough study of home schooling was published last week in the journal Education Policy Analysis Archives. Lawrence Rudner, a statistician at the University of Maryland, looked at the standardized test scores of more than 20,000 home-schooled children across the country.