I'm using JMP Pro 12 and would like to know how to define the reference value of a nominal variable.
For example, in order to use this variable in a Cox model.
Without any defined reference for the nominal variable, JMP provides HR for each comparison between 2 groups, whereas i would like to compare each other group to the reference group only.
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i think what you are looking for comes from the times multiple category variables were introduced as a set of dummy variables. therefore, try the following:
let us know if it helps,
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