Functions in this page are used to specify the format of output results.
They are intended to provide the argument of functions such as
Currently there are three types of output:
that the result should be written into a file,
the result to be returned as R objects, and
the result is not needed and will not be returned.
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Path to the output file.
An object of class "Output" as required by
Yixuan Qiu <http://statr.me>