# this function makes a Variance Dispersion Graph of a response surface design

### Description

This function calls the function Vardsgr which uses Vining's (1993) fortran code to get the coordinates of a variance dispersion graph, and then makes the plot.

### Usage

1 | ```
Vdgraph(des)
``` |

### Arguments

`des` |
des is a matrix or a data frame containing a response surface design in coded or uncoded units. There should be one column for each factor in the design, and one row for each run in the design. The maximum number of rows allowed is 99, and the maximum number of columns is 7. |

### Value

vdgpl

`vdgpl` |
This is a graph containing the Variance Dispersion Graph |

### Note

This function calls the function Vardsgr to get the coordinates for the plot.

### Author(s)

John S. Lawson lawson@byu.edu

### 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.

### Examples

1 2 |

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