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Jul 10, 2014 11:23 AM
(1128 views)

I routinely perform ttests on unpaired and independent data sets. The dropdown in the oneway analysis report allows you to select for paired ttest. I am aware of the ANOM feature, but would still like to perform a ttest on independent data. Does JMP provide this feature.

1 REPLY

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Hi dmahan1,

The t-test options available in Fit Y by X (with a nominal X and continuous Y) are all for independent samples (both Means/ANOVA, and t-test compute independent samples t-test, assuming equal variance and not assuming equal variance respectively). The options under "Compare Means" are not for paired tests, but for pair-wise tests (comparisons of pairs of means, treated as independent samples). For independent measures tests, data must be arranged to have a single column for the response variable, and another variable (nominal) that identifies groups. For example:

Name Final Exam Training Group

John 87 Experimental

Timmy 76 Experimental

Gloria 88 Control

...

For paired t-tests, you can use the "Matched Pairs" platform. For this platform data must be arranged to have paired observations in two columns. For example:

Name Test 1 Test 2

John 15 20

Timmy 25 28

Gloria 31 32

I hope this helps!

Julian