Definition of "versus"

In polling by the Pew Research Center in November 2008, fully half the respondents thought the two parties would cooperate more in the coming year, versus only 36 percent who thought the climate would grow more adversarial.

2012 November 7, Matt Bai, “Winning a Second Term, Obama Will Confront Familiar Headwinds”, in New York Times‎

If, for example, we select random people entering a workout gym, versus if we pick random people entering a hospital, we will get very different samples.

2005, Robert E. Weiss, Modeling Longitudinal Data, Springer, page 104