Getting Started with the SAS(R) 9.2 ADX Interface for Design of Experiments
| Fractional Factorial Designs |
Experimental Objective
A quality engineer observes that too many units manufactured by an injection molding process exhibit excessive shrinkage. He designs a fractional factorial screening design to determine the causes of shrinkage with variables as shown in Table 4.1.
Table 4.1: Variables in the Injection Molding Experiment| Type | Variable | Factor Name | Low | High |
| Factors | MTEMP | Mold temperature | -1 |  |
| SSPD | Screw speed | -1 | | |
| HTIME | Holding time | -1 | | |
| CTIME | Cycle time | -1 | | |
| GSIZE | Gate size | -1 | | |
| HPRESS | Holding pressure | -1 | | |
| Response | SHRINK | Observed shrinkage ( 10) |
Task List
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