Creating two-way graphics with Granova

To install the latest copy of granova from CRAN

install.packages("granova", dependencies = TRUE)

Next, load the package

library(granova)

Now, you can try some sample graphics. The code below creates 3 different 3-D examples of two-way graphics

# using the R dataset warpbreaks; see documentation 
?warpbreaks

# (first surface flat since fit = 'linear' (default); 
# second surface shows curvature)
granova.2w(data=warpbreaks)

granova.2w(
  data    = warpbreaks, 
  formula = breaks ~ wool + tension
)

granova.2w(
  data    = warpbreaks, 
  formula = breaks ~ wool + tension, 
  fit     = 'quadratic'
)