No research determines how many spins a song "requires". Music tests determine which songs to play a lot, which to play less and which not to play. The PD will determine the rotations based on that and an analysis of time spent listening by heavier users of the station.Having worked in Dayton in the past, I find it hard to believe that anyone has money to spend on "research" to determine how many spins "Radar Love" requires. This isn't 1990 anymore.
In many cases, stations of the same format in similar markets share music tests. Back in the 90's I shared AMT expenses for a country station in Tallahassee with other country stations in Albany and Pensacola. We rotated tests between markets and each market got a test every 18 months. Oh, and we did not discuss the test outside of the GM and PD... it was a "secret" to the rest of the staff.