Variance Dispersion Graphs and Fraction of Design Space Plots
Description
Facilities for constructing variance dispersion graphs, fraction-
of-design-space plots and similar graphics for exploring the properties of
experimental designs. The design region is explored via random sampling, which
allows for more flexibility than traditional variance dispersion graphs. A
formula interface is leveraged to provide access to complex model formulae.
Graphics can be constructed simultaneously for multiple experimental designs
and/or multiple model formulae. Instead of using pointwise optimization to
find the minimum and maximum scaled prediction variance curves, which can be
inaccurate and time consuming, this package uses quantile regression as an
alternative.