Names, expressions, numeric values, and character strings are converted to
one-sided formulae. If
object is a formula, it must be
one-sided, in which case it is returned unaltered.
a one-sided formula, an expression, a numeric value, or a character string.
a one-sided formula representing
José Pinheiro and Douglas Bates
asOneSidedFormula("age") asOneSidedFormula(~ age)
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