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This is AsIs function for compatibility purpose. See AsIs help.
AsIs
I(x)
an object
A copy of object with class "AsIs" prepared to the class(es).
Function has two main usage. See AsIs help.
Chambers, J. M. (1992) Linear models. Chapter 4 of statistical models in S eds J. M. Chamber and T. J. Hastie, Wadsworth & Brooks/Cole.
# NOT RUN { ## The function is currently defined as "I" # }
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