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: erinm.hodg...@gmail.com [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.