Thanks a lot. I’ve got it just now. On Wed, Aug 26, 2020 at 6:03 PM peter dalgaard <pda...@gmail.com> wrote:
> It is because you don't know whether you want it or not. > > It is a bit more obvious with integer indexing, as in color[race]: if race > is NA you don't know what color to put in, but the result should be the > same length as race. > > With logical indices, the behaviour is a bit annoying, but ultimately > follows from the coercion rules: You might think that you could treat NA as > FALSE (& the subset() function does just that), but then you'd get the > problem that x[NA] would differ from x[as.integer(NA)] because NA is of > mode "logical", lowest in the coercion hierarchy. > > -pd > > > On 26 Aug 2020, at 17:06 , Elham Daadmehr <e.daadm...@gmail.com> wrote: > > > > Thanks guys. but I'm a bit confused. the input is the first column > (z[,1] and z1[,1]). > > How is it possible that a subset of a non-NA vector, contains NA? > > > > On Wed, Aug 26, 2020 at 4:58 PM Eric Berger <ericjber...@gmail.com> > wrote: > > Good point! :-) > > > > > > On Wed, Aug 26, 2020 at 5:55 PM peter dalgaard <pda...@gmail.com> wrote: > > Offhand, I suspect that the NAs are in the 8th column. > > > > > On 26 Aug 2020, at 10:57 , Elham Daadmehr <e.daadm...@gmail.com> > wrote: > > > > > > Hi all, > > > > > > I have a simple problem. I get stuck in using the imported spss data > (.sav) > > > using "read.spss". > > > I imported data (z) without any problem. After importing, the first > column > > > doesn't contain any "NA". but when I choose a subset of it (like: > > > z[z[,8]=="11"|z[,8]=="12"|z[,8]=="14",]), lots of NA appears (even in > the > > > first column). > > > > > > The (.sav) file is the output of Compustat (WRDS). > > > > > > It is terrible, I can't find the mistake. > > > > > > Thank you in advance for your help, > > > Elham > > > > > > [[alternative HTML version deleted]] > > > > > > ______________________________________________ > > > 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. > > > > -- > > Peter Dalgaard, Professor, > > Center for Statistics, Copenhagen Business School > > Solbjerg Plads 3, 2000 Frederiksberg, Denmark > > Phone: (+45)38153501 > > Office: A 4.23 > > Email: pd....@cbs.dk Priv: pda...@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. > > -- > Peter Dalgaard, Professor, > Center for Statistics, Copenhagen Business School > Solbjerg Plads 3, 2000 Frederiksberg, Denmark > Phone: (+45)38153501 > Office: A 4.23 > Email: pd....@cbs.dk Priv: pda...@gmail.com > > > > > > > > > > [[alternative HTML version deleted]] ______________________________________________ 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.