Vardsgr: Loads compiled fortran in shared file vdg

In Vdgraph: Variance dispersion graphs and Fraction of design space plots for response surface designs

Description

This function loads and runs the compiled fortran code vdg. vdg is Vining's 1999 JQT fortran code for producing variance dispersion graphs.

Usage

  
Vardsgr(ndpts, kvar1, kdv1, rdes)

Arguments

ndpts	This is the number of runs in the response surface design (maximum=99).
kvar1	This is the number of factors in the design matrix (maximum=6).
kdv1	This is the product of ndpts and kvar1.
rdes	This is the response surface design matrix stored as a vector of the concatenated columns of the design matrix, one column for each factor in the design.

Value

vdgr

vdgr

This is the matrix of coordinates for the variance dispersion graph. It is stored as a vector of concatenated columns. Each column is of length 20, and there are four columns in the matrix. The first column is the radius from the center of the response surface design. The second column is the maximum variance of a predicted value, the third column is the minimum variance of a predicted value, and the fourth column is the average variance of a predicted value.

Note

This function is called by the function Vdgraph.

Author(s)

John S. Lawson [e-mail]

References

1. Vining, G. "A Computer Program for Generating Variance Dispersion Graphs" Journal of Quality Technology, Vol 25, No. 1, pp. 45-58, 1993. 2. Vining, G. "Corrigenda" Journal of Quality Technology, Vol 25, No. 4, pp 333-335. 1993.

Vdgraph documentation built on May 2, 2019, 4:58 p.m.