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.
asOneSidedFormula(object)a one-sided formula, an expression, a numeric value, or a character string.
a one-sided formula representing object
# NOT RUN {
asOneSidedFormula("age")
asOneSidedFormula(~ age)
# }
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