"The Harvard/Northeastern study is based on a survey of nearly 4,000 Americans conducted online in 2015 by a market research company, GfK, with a nationally rep

"The Harvard/Northeastern study is based on a survey of nearly 4,000 Americans conducted online in 2015 by a market research company, GfK, with a nationally representative panel of opt-in participants who are compensated to complete surveys on a variety of issues." So, total garbage, then? Most gun owners I know keep the fact that they own guns private. They will not tell the truth when telephone pollsters call ("Oh, no... no guns here!") and they certainly aren't going to be participating in some online "opt-in" survey.