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This function is only intended to be used within a formula when supplied to e.g. survtab_ag and should not be used elsewhere.
survtab_ag
adjust(...)
variables to adjust by, e.g. adjust(factor(v1), v2, v3)
adjust(factor(v1), v2, v3)
Returns a list of promises of the variables supplied which can be evaluated.
# NOT RUN { y ~ x + adjust(z) # }
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