Hello!
I generate the following two data frames:
> xa.df <- data.frame(x=rnorm(10),time=2001:2010)
> xa.df
x time
1 -1.73207086 2001
2 -0.84014049 2002
3 -0.02332163 2003
4 -1.47236670 2004
5 -0.17736265 2005
6 -1.27134314 2006
7 -2.53425374 2007
8 0.79132952 2008
9 1.16574188 2009
10 1.99660600 2010
> tim1 <- c("2010-01","2010-02","2010-03","2010-04","2011-01","2011-02",
+ "2011-03","2011-04")
> xb.df <- data.frame(y=rnorm(8),time=tim1)
> xb.df
y time
1 -1.5175587 2010-01
2 1.2035292 2010-02
3 -0.7313063 2010-03
4 -1.5544370 2010-04
5 -0.5907269 2011-01
6 1.0634754 2011-02
7 0.9029293 2011-03
8 0.5996780 2011-04
>
What is the best way to turn the time columns into date objects (annual and
quarterly)?
Thanks,
Erin
--
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: [email protected]
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