Did you even bother to read the article?
But by the mid-2000s, the federal government stopped asking the questions, leaving researchers to rely on much smaller surveys, like the General Social Survey, which is conducted by NORC, a research center at the University of Chicago.
Measuring the level of gun ownership can be a vexing problem, with various recent national polls reporting rates between 35 percent and 52 percent. Responses can vary because the survey designs and the wording of questions differ.
But researchers say the survey done by the center at the University of Chicago is crucial because it has consistently tracked gun ownership since 1973, asking if respondents “happen to have in your home (or garage) any guns or revolvers.”
The centerÂ’s 2012 survey, conducted mostly in person but also by phone, involved interviews with about 2,000 people from March to September and had a margin of sampling error of plus or minus three percentage points....
http://www.nytimes.com/2013/03/10/u...is-down-survey-shows.html?smid=tw-share&_r=2&
I don't exactly trust that the University of Chicago's 2,000 person sample was properly designed. It is also Quite Plausible that, given the hysteria in the media attacking gun owership, that some gun owners may not provide truthful answers.