# Adds a footnote indicated by letters rather than numbers to Group 1
footnote_plan <- footnote_plan(
footnote_structure(footnote_text = "Source Note", group_val = "Group 1"),
marks="letters")
# Adds a footnote to the 'Placebo' column
footnote_plan <- footnote_plan(
footnote_structure(footnote_text = "footnote", column_val = "Placebo"),
marks="numbers")
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