SEO is a Craft not a Science
Recently there has been a backlash in the SEO industry against what is deemed to be a non-scientific approach when it comes to SEO testing or collecting statistical data. Some people argue that you have to treat SEO as part of computer science and be very strict about it. Following this logic you are basically forbidden to do any SEO testing yourself unless you have some actual scientists doing the research.
While I am not sure why some people attempt to push in this direction I can only say it won’t work. SEO is a craft not a science. First off there are far too many variables to determine in SEO to be able to treat it scientifically. Also, if anything, SEO would have to be a social science as most things in SEO depend on human behavior. People writing algorithms, people linking, people creating content.