plotfunctions {plotfunctions}

Package plotfunctions: Various Functions to Facilitate Visualization of Data and Analysis

Description

This package provides a set of simple tools for building plots incrementally, starting with an empty plot region, and adding bars, data points, regression lines, error bars, gradient legends, density distributions in the margins, and even pictures. The package builds further on R graphics by simply combining functions and settings in order to reduce the amount of code to produce for the user. As a result, the package does not use formula input or special syntax, but can be used in combination with default R plot functions.

Details

Note: Most of the functions were part of the package itsadug, which is now split in two packages: 1. the package itsadug, which contains the core functions for visualizing and evaluating nonlinear regression models, and 2. the package plotfunctions, which contains more general plot functions.

See vignette(package='plotfunctions', 'plotfunctions') for an overview with examples.

Basic functions

• emptyPlot generates an empty plot.

• plot_error adds line with (shaded) confidence interval.

• add_bars adds bars to a (bar)plot.

• errorBars adds confidence intervals to points or bars.

Specialized plots

• color_contour and plotsurface are wrappers around image and contour for making easily colored surface plots for interactions with two (or more) continuous predictors.

• plot_image can be used to add a picture to a plot, or to make a picture the background of a plot.

• marginDensityPlot adds distributions in the margins of the plot.

• check_normaldist overlays density of data to normal distribution. Might help with interpretation of QQ-plots that are generally used to test for normality.

Other useful features

• alpha and alphaPalette are simple function to make colors and palettes transparent.

• legend_margin adds a legend in the margins of a plot.

• gradientLegend adds a color legend to a plot.

• drawDevArrows for drawing arrows or lines between different panels.

• getFigCoords retrieve the cartesian coordinates relative to the plot axes for given proportions of the plot region or given proportions of the figure. #'

• A list of all available functions is provided in help(package='itsadug').

Author(s)

Jacolien van Rij

Maintainer: Jacolien van Rij ([e-mail])

University of Groningen, The Netherlands & University of Tuebingen, Germany