Modeling and Multivariate Methods - SAS

388 Performing Categorical Response Analysis Chapter 15
Failure Rate Examples
Grouping Option
is used to give results for individual X variables, or for combinations of the variables.
Combinations gives frequency results for combinations of the X variables.
Each Individually gives frequency results for each X variable individually.
Both gives frequency results for combinations of the X variables, and individually.
Failure Rate Examples
The following examples come from testing a fabrication line on three different occasions under two
different conditions. Each set of operating conditions yielded 50 data points. Inspectors recorded the
following kinds of defects:
1. contamination
2. corrosion
3. doping
4. metallization
5. miscellaneous
6. oxide defect
7. silicon defect
Each unit could have several defects or even several defects of the same kind. We illustrate the data in a
variety of different shapes all supported directly by the Categorical platform.
Response Frequencies
Suppose the data have columns containing frequency counts for each batch and a column showing the total
number of units of the batch (as in Failure3Freq.jmp in the Quality Control folder).
To generate the appropriate analysis, highlight the frequency variables and click Response Frequencies.
The X, Grouping Category columns are clean and date, and SampleSize is Sample Size.
In the resulting output, a frequency count table shows the total number of defects for each defect type.
There is a separate row for each of the seven batches. The last two columns show the total number of defects
(Responses) and the total number of units (Cases).