Add median annotation to KM plot — add_median

Adds median survival annotation to a Kaplan-Meier plot.

Usage

add_median_annotation(
  medians_df,
  med.digits,
  med.cex,
  med.font,
  xmed.fraction,
  ymed.offset
)

medians_df: Data frame with quantile results. Should contain columns quantile, lower, upper, and group.
med.digits: Integer; number of digits to display for median and confidence interval.
med.cex: Numeric; text size for median annotation.
med.font: Integer; font for median annotation.
xmed.fraction: Numeric; fraction of the x-axis for annotation placement (e.g., 0.8 for 80\% to the right).
ymed.offset: Numeric; offset from the top of the plot for annotation placement.

Invisibly returns NULL. Used for plotting side effects.