result$y is "minus OOB rgain" on training set for methods RF or MC.RF.
result$y is "minus rgain" on test set (=validation set) for all other methods.
result$y is the quantity which the tuner seeks to minimize.
return value from a prior call to
a list from which we need here the following entries
[NULL] if not NULL, add this data frame to the return value (may cost a lot of memory!)
result, an object of class
(and optionally also
Wolfgang Konen, FHK, Sep'2010 - Oct'2011
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