Basic Analysis and Graphing - SAS

Chapter 5 Performing Oneway Analysis 163
Additional Examples of the Oneway Platform
Example of an Analysis of Means for Variances Chart
This example uses the Spring Data.jmp sample data table. Four different brands of springs were tested to see
what weight is required to extend a spring 0.10 inches. Six springs of each brand were tested. The data was
checked for normality, since the ANOMV test is not robust to non-normality. Examine the brands to
determine whether the variability is significantly different between brands.
1. Open the Spring Data.jmp sample data table.
2. Select Analyze > Fit Y by X.
3. Select Weight and click Y, Response.
4. Select Brand and click X, Factor.
5. Click OK.
6. From the red triangle menu, select Analysis of Means Methods > ANOM for Variances.
7. From the red triangle menu next to Analysis of Means for Variances, select Show Summary Report.
Figure 5.15 Example of Analysis of Means for Variances Chart
From Figure 5.15, notice that the standard deviation for Brand 2 exceeds the lower decision limit.
Therefore, Brand 2 has significantly lower variance than the other brands.
Example of the Each Pair, Student’s t Test
This example uses the Big Class.jmp sample data table. It shows a one-way layout of weight by age, and
shows the group comparison using comparison circles that illustrate all possible t-tests.
1. Open the Big Class.jmp sample data table.