Description Usage Arguments Details Value See Also Examples
This is a special function used in the drm
or depratio
syntax.
It identifies correlated groups of observations, and is used on
the right hand side of a formula.
1 | cluster(x)
|
x |
A character, factor, or numeric variable. |
The function's only action is semantic, to mark a variable as the cluster indicator.
x
1 |
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