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tp4630555
2012 May 19
2
Subset based on a date range
...xcluded in the new frame.
six_months<-subset(Two_years, vdate>2011-01-01|vdate<2011-07-01)
or all data is excluded
six_months<-subset(Two_years, vdate>2011-01-01&vdate<2011-07-01)
--
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