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dr has been tested with Splus versions 5 and 6
under Linux. If you want to use dr with Splus, you must either: (1) set
the variable whichengine <- "s6" before you load the file
dr.R, or else you must set this value on line 21 of the file.
Otherwise, the same code is used for and Splus. All options
available in seem to work in Splus, except that the argument
mark.by.y on plots and coplots and the function
markby do not work with Splus.
Sandy Weisberg
2002-01-10