TABLE OF CONTENTS In Chapters 3 and 5 we presented results for a two-factor crossed random design. We now present some results for a three-factor crossed random design.
Table 8.16 presents a partial listing of data from a gauge R&R study used in the fabrication of magnetic tape for computerized data storage. In this study, o automated test stations (operators) are used to evaluate the quality of p tape heads (parts). To measure characteristics of the heads, t tapes are used in each test station. In this design, all p heads are measured with each of the ot test station tape combinations. There are r = 2 replicates for each treatment condition. The response variable is Forward resolution of a tape head. In the process of writing information to magnetic tape, voltage is measured at two different frequencies. The resolution is a ratio of these two voltages. There is no unit of measurement on the ratio, and it is expressed as a percentage. Ideally, this ratio should be 100%. The specification limits are LSL = 90% and USL = 110%. Forward resolution is measured when the drive writes in the forward direction.
| Part | Operator | Tape | Y |
|---|---|---|---|
| 1 | 1 | 1 | 102.8917 |
| 1 | 1 | 1 | 103.3077 |
| 1 | 1 | 2 | 104.1766 |
| 1 | 1 | 2 |
