On Sat, Jan 31, 2015 at 2:16 PM, Mikael Olai Milhøj <mikaelmil...@gmail.com> wrote: > Hi > > Is there an easy way to drop, for instance, the first 4 observation of a > time series object in R? I have tried to google the answer without any > luck. > > To be more clear: > Let us say that I have a time seres object x which data from 2000Q1 to > 2014Q4 but I only want the data from 2001Q1 to 2014Q4.How do I remove the > first four elements? > > By using x[5:?] R no longer recognize it as a ts.object. >
1. We could convert it to a zoo series, drop the first 4 and convert back: For example, using the built in presidents ts series: library(zoo) as.ts(tail(as.zoo(presidents), -4)) 1a. This would work too: library(zoo) as.ts(as.zoo(presidents)[-(1:4)]) 2. Using only base R one can use window like this since 4 observations is one cycle (given that the frequency of the presidents dataset is 4. window(presidents, start = start(presidents) + 1) or in terms of 4: window(presidents, start = start(presidents) + 4 * deltat(presidents)) Here deltat is the time between observations so we want to start 4 deltat's later. -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
