off: Helper functions to enable easier model specification
In Torvaney/regista: Soccer Analytics

Modelling team strengths often requires separate parameters for offence and defence. These helper functions provide a quick way to turn a factor of team names into a factor of offence or defence levels

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off(x)

def(x)

`x`	A factor containing team names

teams <- factor(c("Arsenal", "Liverpool", "Barcelona", "Dortmund"))
off(teams)
#> [1] off___Arsenal   off___Liverpool off___Barcelona off___Dortmund
#> Levels: off___Arsenal off___Barcelona off___Dortmund off___Liverpool