ggobservation

Overview

ggobservation is an extension for ggplot2 which count the number of observations and plots it using the geom_observation() function.

Installation

# This package should be installed from GitHub:
# install.packages("devtools")
devools::install_github("Holer90/ggobservation")

Usage

To use ggobservation simply add the geom_observation() layer to the plot. The underlying stat (counting) is automatically calculated for all panels or groups, so it integrates with colour and facets.

library(ggplot2)
library(ggobservation)

ggplot(mpg, aes(displ, hwy, colour = drv)) + 
  geom_point() + 
  geom_observation()

Settings

These settings are available to geom_observation().

• compute: (group, panel) controls if calculations are per panel or per group.
• hjust: (top, middle, bottom) where the annotation is added horizontally
• vjust: (left, center, right) where the annotation is added vertically
• prefix: (string, default: "n = ") the prefix before the count.
• suffix: (string, default: "") the suffix after the count.
• separation_factor: (number, default: 1) the separation of annotations when there are multiple groups in a single panel.

Tasks

• Fix spacing for compute = "group", and deprecate separation_factor.
• Do I need the helper functions, or do I get them by loading tidyverse?
• Add label setting, which extend geom_label instead of geom_text.