Example Contrasting All of the Compare Means Tests

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Basic Analysis • Oneway Analysis • Additional Examples of the Oneway Platform • Example Contrasting All of the Compare Means Tests

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Select Help > Sample Data Library and open Big Class.jmp.

Select Analyze > Fit Y by X.

Select weight and click Y, Response.

Select age and click X, Factor.

Click OK.

From the red triangle menu, select each one of the Compare Means options. For the With Control, Dunnett’s option, select age 17 as the control group.

Although the four methods all test differences between group means, different results can occur.

Figure 5.72 Comparison Circles for Four Multiple Comparison Tests

From Figure 5.72, notice that for the Student’s t and Hsu methods, age group 15 (the third circle from the top) is significantly different from the control group and appears gray. But, for the Tukey and Dunnett method, age group 15 is not significantly different, and appears red.

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Help created on 7/12/2018