Add a Side Table to a Forest Plot — add_forest

Compose a side table onto a forest plot after the plot has been styled. This helper should generally be added as the final step because it returns a patchwork composition instead of a plain ggplot.

Usage

add_forest_table(
  plot = NULL,
  position = c("left", "right"),
  show_terms = TRUE,
  show_n = NULL,
  show_estimate = TRUE,
  show_p = FALSE,
  term_header = "Term",
  n_header = "N",
  estimate_label = "Estimate",
  p_header = "P-value",
  digits = NULL,
  text_size = NULL,
  striped_rows = NULL,
  stripe_fill = NULL,
  stripe_colour = NULL,
  grid_lines = FALSE,
  grid_line_colour = "black",
  grid_line_size = 0.3,
  grid_line_linetype = 1
)

Arguments

plot: A plot created by ggforestplot(). Leave as NULL to use + add_forest_table(...) syntax.
position: Whether to place the table on the left or right of the forest plot.
show_terms: Whether to show the term column in the table.
show_n: Whether to show the N column. Defaults to TRUE when the underlying plot data include an n column.
show_estimate: Whether to show the formatted estimate and confidence interval column.
show_p: Whether to show the p-value column to the right of the estimate column.
term_header: Header text for the term column.
n_header: Header text for the N column.
estimate_label: Header label for the estimate column.
p_header: Header text for the p-value column.
digits: Number of digits used when formatting estimates and p-values. Defaults to 2.
text_size: Text size for table contents. Defaults to 3.2.
striped_rows: Whether to draw alternating row stripes behind the table. Defaults to the stripe setting used in ggforestplot().
stripe_fill: Fill colour used for striped rows. Defaults to the stripe fill used in ggforestplot().
stripe_colour: Outline colour for striped rows. Defaults to the stripe outline used in ggforestplot().
grid_lines: Whether to draw black horizontal grid lines in the table.
grid_line_colour: Colour used for the table grid lines.
grid_line_size: Line width used for the table grid lines.
grid_line_linetype: Line type used for the table grid lines.

Value

A patchwork-composed plot containing the forest plot and side table, or a ggplot add-on object when plot = NULL.

Examples

coefs <- data.frame(
  term = c("Age", "BMI", "Treatment"),
  estimate = c(0.3, -0.2, 0.4),
  conf.low = c(0.1, -0.4, 0.2),
  conf.high = c(0.5, 0.0, 0.6),
  sample_size = c(120, 115, 98),
  p_value = c(0.012, 0.031, 0.004)
)

p <- ggforestplot(coefs, n = "sample_size", p.value = "p_value")
add_forest_table(p, position = "left", show_n = TRUE, show_p = TRUE, estimate_label = "Beta")


ggforestplot(coefs, n = "sample_size", p.value = "p_value") +
  add_forest_table(position = "right", show_n = TRUE, show_p = TRUE, estimate_label = "Beta")