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[JMP 7, JMP 8] When I use nominal scale explanatory variables, the confidence intervals for the odds ratio and risk ratio are not displayed. Is there a way to display them?
Created: Feb 6, 2025 04:57 PM  |  Last Modified: Feb 12, 2025 11:58 PM

Note
In JMP 9 and later, even when the explanatory variables are nominal (ordinal), confidence intervals for odds ratios and risk ratios can be displayed without creating dummy variables, as shown in the answer below.


In JMP 7 and JMP 8, the specifications for odds ratios and risk ratios when nominal or ordinal scales are used as explanatory variables have been changed.


JMP 7, JMP 8
Calculate odds ratios and risk ratios based on a certain level
JMP 7 and earlier
 Calculate odds ratios and risk ratios based on the average effect of explanatory variables
(When odds are unit)

This allows JMP 7 and JMP 8 to display level-based odds or risk ratio estimates for all level combinations.
However, currently, the confidence intervals are not displayed.

Therefore, to calculate confidence intervals for odds ratios or risk ratios where the explanatory variables are nominal (ordinal) scale, a dummy variable (continuous scale of 0/1) will be created.

Specific methods for creating and operating the data are listed in the "Related Materials" section of FAQ #2078 (How to calculate odds ratios and hazard ratios (risk ratios) using JMP and points to note).


FAQ #3309

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This post originally written in Chinese (Simplified) and has been translated for your convenience. When you reply, it will also be translated back to Chinese (Simplified).

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