Parameters | Expression Parameters | Variables Defining Blocks

Variables Defining Blocks
Use this field to specify the variables whose levels define blocks corresponding to a single random effect. Observations within the same block are assumed to be correlated.
To Specify Variables Defining Blocks:
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All of the variables in the data set are displayed in the Available Variables field.
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Click to add the highlighted variable(s) to the Variables Defining Blocks field, as shown below: