This survey seems to consider someone a freelancer if they "have engaged in supplemental, temporary, project or contract-based work, within the past 12 months".

This survey seems to consider someone a freelancer if they "have engaged in supplemental, temporary, project or contract-based work, within the past 12 months". I'd love to see the actual questions asked (if someone has a link, please share), because it seems to me like the answers may vary widely based on the wording of the question. I work a full time job as a developer; but for example, a few months ago, I charged a former employer a trivial amount to fix a bug in a system that I was familiar with from when I worked there. My wife is a PhD student. But she took a few babysitting jobs over the summer before her program started. Does that make us both freelancers? We certainly don't consider ourselves to be, but depending on how the question is framed, we might be categorized as such.