Plot Histograms for Each Variable

Given a data frame or matrix of numeric variables, this function returns a named list of ggplot2 histogram (or bar) plots—one per column. For each variable it displays a vertical line at the mean and an annotation of mean and standard deviation (or just mean).

Usage

plot_histogram(df, tol = 1e-08, SD = TRUE)

Arguments

df

A data.frame or matrix whose columns are the variables to plot.

tol

Numeric; tolerance for deciding whether a variable is integer-valued. Values within tol of an integer are plotted as counts (bars).

SD

Logical; if TRUE, annotate each plot with mean and standard deviation; if FALSE, annotate with mean only.

Value

A named list of ggplot2 objects, one per column of df.