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2011 Jun 22
2
Linking 2 columns in 2 databases and applying a function
Hi all,
I have two datasets, one that represents a long-term time series and one
that represents summary data for the time series. It looks something like
this:
x<-data.frame(Year=c(2001,2001,2001,2001,2001,2001,2002,2002,2002,2002,2002,2002),
Month=c(1,1,1,2,2,2),Q=c(5,5,5,6,6,6,3,3,3,4,4,5))
y<-data.frame(Year=c(2001,2001,2002,2002),Month=c(1,2,1,2),Threshold_Q=c(5,5,4,4))
What I'd