ACHEMA 2000: Stavex 4.3

Stavex is a user-friendly PC-based software system enabling experimenters in research and development to apply statistical design and analysis of experiments in their routine work independently of a statistician. It studies the relationship of specified factors and responses. The ultimate goal is to find the optimal settings of all factors actually influencing the responses.

The system allows for process factors (temperature, concentration, …) as well as for mixture factors which have to fulfill a summing –up condition typical for mixtures or formulations. It also supports the combination of responses in the form of a cost function assigning weights to the responses or a desirability function combining individual specification intervals. This way trade-offs between the responses can be studied.

Stavex supports sequential planning. It integrates statistical experimental design, statistical experimental design, statistical evaluation of results, and guidance to follow-up designs, i.e. the whole process of experimentation. The software typically runs through three stages of statistical experimental design:

• screening using linear models for factor reduction
• modeling for further factor reduction using linear models with interactions, and
• optimization for determining the optimal levels of the remaining factors.

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