Like this:
New study detects media's liberal tilt which supposedly "scientifically proves" this idea that the "MSM" is "90% lefty" . . .
"...the authors start by examining the ratings of members of Congress, according to Americans for Democratic Action (ADA)..." I tried to keep reading after that...and I don't really know who ADA is, or have any reason to think they swing one way or the other . . . but this isn't
science. This subject isn't something that can be scientifically studied. It's like "scientifically" debating whether God exists without establishing a definition of what God even means. You can't base science on the shifting sands of perception . . . what does "liberal" mean exactly? Putting alot of gravy, a "liberal" amount on your mashed potatoes? that debate would be based on source data from Americans For Tasty Side Dishes (ATSD) - but the catch is
the source data isn't scientific data!