Re-generating a fractional factorial design resolution IV or lower may give wrong design (Q30)

Symptoms: 

If you generate a fractional factorial design of resolution IV or lower and then change your mind, and go to Design | Objective, select RSM and generate a CCC or CCF design, the generated RSM design is incorrect.

Cause: 

This is due to the fact that MODDE does not delete the initial fractional factorial design but updates it incorrectly.

Workaround: 

Copy the factors in a new investigation and then generate the CCC or CCF design.

Status: 

Fixed in the next release.

More Information: 

If you generate a fractional factorial design of resolution IV or lower and then change your mind, and go to objective, select RSM and generate a CCC or CCF design, the generated RSM design is incorrect.

Date modified: Aug 20, 2013
Article type: 
Problem