The densr package allows for a particular type of density estimation to be overlayed to a histogram of data. This density type is specified by the user, and can be one of three permitted options: parametric Gaussian density estimation, nonparametric Kernel density estimation or a continuous density estimator called the frequency polygon.
The package itself does not contain datasets but the functions can be applied to any continuous variable within R built-in data.
In general, frequency_polygon is used to obtain the coordinates of the frequency polygon density estimate, should its type be later specified. create_hist_dens then intuitively produces an object of class 'hist_dens' for chosen data and a branch of density, on which a plot method for this class is called. The output of the dedicated plotting function can be enhanced using additional arguments to the inner base R function plot or the constituent functions curve and lines from the graphics package.
You can install the densr package from GitHub, using:
# If required install devtools:
# install.packages('devtools')
devtools::install_github('rachel-mc/densr')
To access the built vignette document for a more thorough introduction, use the code:
devtools::install_github('rachel-mc/densr', build_vignettes = TRUE)