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Renders the expression for column split in rtables depending on:
rtables
the expected or not arm comparison
the expected or not arm combination
split_col_expr(compare, combine, ref, arm_var)
a call
call
(logical) if TRUE the reference level is included.
logical
TRUE
(logical) if TRUE the group combination is included.
(character) the reference level (not used for combine = TRUE).
character
combine = TRUE
(character) the arm or grouping variable name.
split_col_expr( compare = TRUE, combine = FALSE, ref = "ARM A", arm_var = "ARMCD" )
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