Do Homeschoolers Really Score Higher? What the Research Actually Supports

It's one of the most repeated claims in homeschooling circles: homeschooled kids outperform their public-school peers by 15 to 30 percentile points on standardized tests. It shows up in blog posts, curriculum marketing, and homeschool conference talks alike. The claim isn't fabricated — but it comes with caveats that are usually left out, and understanding them matters for anyone trying to actually evaluate whether homeschooling "works."

Where the Numbers Come From

The most frequently cited data does show homeschoolers scoring well. Brian Ray's 2010 nationwide study analyzed standardized test results from over 11,000 homeschooled students and found mean scores at or above the 80th percentile across nearly every subtest. Earlier research by Rudner (1999), examining more than 20,000 homeschooled K-12 students, found similarly strong results.

The Catch: Who Gets Tested

Here's the problem researchers on both sides of the debate agree on: these studies rely almost entirely on self-selected samples. Parents who volunteer their child's test scores for a study — or who choose to have their child tested at all — are disproportionately likely to be higher-income, more highly educated, and more confident in how their child is doing academically. Parents whose children are struggling are simply less likely to seek out testing or participate in research to begin with.

The Coalition for Responsible Home Education (CRHE), a group generally critical of under-regulated homeschooling, points to a telling comparison: in states that require all homeschooled students to take standardized tests — removing the self-selection problem — the achievement gap between homeschooled and traditionally schooled students shrinks substantially compared to the 15-to-30-point gap seen in volunteer-based studies.

A second layer of self-selection shows up in college entrance exam data. Researcher Huseman (2015) notes that homeschoolers who take the SAT or ACT are likely already on the higher-achieving end of the homeschool population as a whole, since research also shows homeschoolers take college entrance exams at a lower rate than public or private school peers.

What About College Attendance?

This is one area where the evidence gets genuinely more mixed. Some research suggests homeschoolers who do attend college complete degrees at high rates — though motivation to finish college and motivation to homeschool through high school may share the same underlying cause, rather than one causing the other. CRHE, on the other hand, cites evidence from one randomized study suggesting homeschooled students may attend college at lower rates than their peers overall — a claim contested by homeschool researchers.

The Honest Middle Ground

Pulling this together, a fair reading looks something like this: homeschooling can produce strong academic outcomes, and it clearly does for many families. But the sweeping claim that homeschoolers universally outperform their peers overstates what the evidence actually supports, because most of the underlying research can’t separate the effect of homeschooling itself from the effect of coming from families that are already more engaged, better-resourced, and more motivated.