Yes, this is as documented. See ? lag.xts under details for the justification and how to change the default if desired.
Michael On Wed, Apr 11, 2012 at 11:13 PM, jpm miao <miao...@gmail.com> wrote: > BTW, zoo is like ts in the application of lag. > In other words, zoo and xts are opposite in this issue. > > 2012/4/12 jpm miao <miao...@gmail.com> > >> Example: >> Will ts objects be obsolete or modified? >> >> > a [,1] >> 1983 Q1 2.747365190 >> 1983 Q2 2.791594762 >> 1983 Q3 -0.009953715 >> 1983 Q4 -0.015059485 >> 1984 Q1 -1.190061246 >> 1984 Q2 -0.553031799 >> 1984 Q3 0.686874720 >> 1984 Q4 0.953911035> lag(a,4) [,1] >> 1983 Q1 NA >> 1983 Q2 NA >> 1983 Q3 NA >> 1983 Q4 NA >> 1984 Q1 2.747365190 >> 1984 Q2 2.791594762 >> 1984 Q3 -0.009953715 >> 1984 Q4 -0.015059485> lag(as.ts(a, start=c(1983,1)),4) Qtr1 >> Qtr2 Qtr3 Qtr4 >> 1982 2.747365190 2.791594762 -0.009953715 -0.015059485 >> 1983 -1.190061246 -0.553031799 0.686874720 0.953911035 >> >> > > [[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. ______________________________________________ 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.
