plot_density function

Create density plots for mixture models

Creates a faceted plot of density plots for an object of class 'tidyLPA'. For each variable, a Total density plot will be shown, along with separate density plots for each latent class, where cases are weighted by the posterior probability of being assigned to that class.

plot_density(
  x,
  variables = NULL,
  bw = FALSE,
  conditional = FALSE,
  alpha = 0.2,
  facet_labels = NULL
)

Arguments

• x: Object to plot.
• variables: Which variables to plot. If NULL, plots all variables that are present in all models.
• bw: Logical. Whether to make a black and white plot (for print) or a color plot. Defaults to FALSE, because these density plots are hard to read in black and white.
• conditional: Logical. Whether to show a conditional density plot (surface area is divided amongst the latent classes), or a classic density plot (surface area of the total density plot is equal to one, and is subdivided amongst the classes).
• alpha: Numeric (0-1). Only used when bw and conditional are FALSE. Sets the transparency of geom_density, so that classes with a small number of cases remain visible.
• facet_labels: Named character vector, the names of which should correspond to the facet labels one wishes to rename, and the values of which provide new names for these facets. For example, to rename variables, in the example with the 'iris' data below, one could specify: facet_labels = c("Pet_leng" = "Petal length").

Returns

An object of class 'ggplot'.

Examples

## Not run:

results <- iris %>%
  subset(select = c("Sepal.Length", "Sepal.Width",
    "Petal.Length", "Petal.Width")) %>%
  estimate_profiles(1:3)
## End(Not run)

## Not run:

plot_density(results, variables = "Petal.Length")
## End(Not run)

## Not run:

plot_density(results, bw = TRUE)
## End(Not run)

## Not run:

plot_density(results, bw = FALSE, conditional = TRUE)
## End(Not run)

## Not run:

plot_density(results[[2]], variables = "Petal.Length")
## End(Not run)

Author(s)

Caspar J. van Lissa