Skip to contents

Plot a correlation matrix as a lower triangle

Source: R/plot_cor_triangle.R
plot_cor_triangle.Rd

Draws the lower triangle of a correlation matrix as a heatmap, with blues for negative and oranges/reds for positive correlations, each cell labelled with its value.

Usage

plot_cor_triangle(
  R,
  types = NULL,
  labels = character(),
  digits = 2,
  text_size = 11
)

Arguments

R

A square correlation matrix with column names, such as the output of het_cor().

types

Optional matrix of correlation types ("Pearson", "Polyserial", "Polychoric") with the same dimensions as R. When given, polyserial cells are marked * and polychoric cells **, and a footnote explains the marks. het_cor() supplies this when plot = TRUE.

labels

Optional display labels, named by variable, e.g. c(WT = "Body weight (kg)"). Unlabelled variables keep their names.

digits

Number of decimal places shown in each cell.

text_size

Font size of the cell values, in points.

Value

A ggplot object.

See also

het_cor()

Examples

R <- cor(mtcars[c("mpg", "disp", "hp", "wt")])
plot_cor_triangle(R, labels = c(wt = "Weight (1000 lb)"))