pathdiagram provides simple functions to draw basic PLS path diagrams in R, just for illustrating purposes (i.e. adding diagrams when writing reports with knitr or Sweave).
The one and only reason to create pathdiagram was the need to plot a path diagram in R. Since I was writing the tutorials and demos for the package plspm I realized that I badly needed path diagrams accompanying my examples. I first tried using the grid package. It was fine but it didn't allow me to have complete control over the looking of the objects (mainly with color of lines, borders, text, etc). Then I tried to use the package diagram but I got the same restrictions. Finally, after some short experiments, I decided to create pathdiagram.
Stable version on CRAN
# stable version
install.packages("pathdiagram")
Development version on github
# development version
library(devtools)
install_github('pathdiagram', username='gastonstat')
# graphic specifications of manifest variables
ingredients = list(
eggs = manifest("Eggs", x = 0.25, y = 0.8, width = 0.1, height = 0.08),
milk = manifest("Milk", x = 0.25, y = 0.65, width = 0.1, height = 0.08),
flour = manifest("Flour", x = 0.25, y = 0.5, width = 0.1, height = 0.08),
sugar = manifest("Sugar", x = 0.25, y = 0.35, width = 0.1, height = 0.08),
butter = manifest("Butter", x = 0.25, y = 0.2, width = 0.1, height = 0.08)
)
# graphic specifications of latent variables
pancakes = latent("Pancakes", x = 0.8, y = 0.65, rx = 0.08, ry = 0.06)
waffles = latent("Waffles", x = 0.8, y = 0.35, rx = 0.08, ry = 0.06)
# open a new wall
wall()
# draw latent variables
draw(pancakes)
draw(waffles)
# draw ingredients
for (i in 1:5) {
draw(ingredients[[i]])
}
# add arrows
for (i in 1:5) {
arrow(from = ingredients[[i]], to = pancakes, start = "east", end = "west")
arrow(from = ingredients[[i]], to = waffles, start = "east", end = "west")
}
Gaston Sanchez (gaston.stat at gmail.com)