Processes | Workflows | Strata Variables

Strata Variables
Strata variables can be selected to perform a stratified analysis when the trait is binary or survival. In a stratified analysis for a binary trait , separate intercepts are fit for each stratum, but a single estimate is obtained for each model effect conditional on the intercepts. Stratified survival analysis involves fitting a separate baseline hazard function for each stratum but again calculating a single set of effect estimates.
A Censor Variable must be selected when performing analysis of a Survival trait. This variable indicates which observations have been censored - often, this is an indicator of whether a patient is living at the end of a study.
To Specify One or More Strata Variables:
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All of the variables in the specified data set are displayed in the Available Variables field.
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Make sure that either Binary or Survival is selected as the Type of Trait .
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