Hi.> a[1] 13 13 14 14 15 15 16 20 21 26> summary(a)Min. 1st Qu. Median Mean 3rd Qu. Max. 13.0 14.0 15.0 16.7 19.0 26.0> mean(a)[1] 16.7> quantile(a)0% 25% 50% 75% 100% 13 14 15 19 26 Clearly, this is not right. My Instructor and I have no idea why the program does that. I removed the program from the computer , installed it again and it still shows the mistake. It is also strange, that I chose "english" as installlanguage, but the program is in german (my OS is in german). Pls help, because otherwise i cannot solve any problems with R. Using Win7 and R version 2.15.0 (2012-03-30). Retep -- View this message in context: http://r.789695.n4.nabble.com/Wrong-Q3-Mean-tp4630223.html Sent from the R help mailing list archive at Nabble.com.
On Wed, May 16, 2012 at 12:22 AM, Retep32 <retepdeluxe at web.de> wrote:> Hi. > >> a > ?[1] 13 13 14 14 15 15 16 20 21 26 >> summary(a) > ? Min. 1st Qu. ?Median ? ?Mean 3rd Qu. ? ?Max. > ? 13.0 ? ?14.0 ? ?15.0 ? ?16.7 ? ?19.0 ? ?26.0 >> mean(a) > [1] 16.7 >> quantile(a) > ?0% ?25% ?50% ?75% 100% > ?13 ? 14 ? 15 ? 19 ? 26 > > Clearly, this is not right. My Instructor and I have no idea why the programReally? It is not at all clear to me what makes this "not right". Have you tried looking at the documentation for quantile? (which you can access by typing ?quantile or help("quantile") ) There are multiple algorithms to calculate quantiles which in practice often yield quite similar results, but, particularly for very small datasets such as are common for class exercises, and a few other cases do behave rather differently. You can caompare the 9 varieties by running this: sapply(1:9, function(i) quantile(a, type = i)) which for me yields: [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] 0% 13 13 13 13.0 13 13.00 13 13.00000 13.0000 25% 14 14 13 13.5 14 13.75 14 13.91667 13.9375 50% 15 15 15 15.0 15 15.00 15 15.00000 15.0000 75% 20 20 20 18.0 20 20.25 19 20.08333 20.0625 100% 26 26 26 26.0 26 26.00 26 26.00000 26.0000 Perhaps one of those is what you are looking for (rows are quantiles, each column uses a different algorithm, types 1 through 9, respectively). Hope this helps, Josh> does that. I removed the program from the computer , installed it again and > it still shows the mistake. ?It is also strange, that I chose "english" as > installlanguage, but the program is in german (my OS is in german). > > Pls help, because otherwise i cannot solve any problems with R. > > Using Win7 and R version 2.15.0 (2012-03-30). > > Retep > > -- > View this message in context: http://r.789695.n4.nabble.com/Wrong-Q3-Mean-tp4630223.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help at 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.-- Joshua Wiley Ph.D. Student, Health Psychology Programmer Analyst II, Statistical Consulting Group University of California, Los Angeles https://joshuawiley.com/
Hi, Probably you could check this:>?quantileParticularly the 'type' option. Best Regards, Pascal ----- Mail original ----- De?: Retep32 <retepdeluxe at web.de> ??: r-help at r-project.org Cc?: Envoy? le : Mercredi 16 mai 2012 16h22 Objet?: [R] Wrong Q3 + Mean. Hi.> a[1] 13 13 14 14 15 15 16 20 21 26> summary(a)? Min. 1st Qu.? Median? ? Mean 3rd Qu.? ? Max. ? 13.0? ? 14.0? ? 15.0? ? 16.7? ? 19.0? ? 26.0> mean(a)[1] 16.7> quantile(a)? 0%? 25%? 50%? 75% 100% ? 13? 14? 15? 19? 26 Clearly, this is not right. My Instructor and I have no idea why the program does that. I removed the program from the computer , installed it again and it still shows the mistake.? It is also strange, that I chose "english" as installlanguage, but the program is in german (my OS is in german). Pls help, because otherwise i cannot solve any problems with R. Using Win7 and R version 2.15.0 (2012-03-30). Retep -- View this message in context: http://r.789695.n4.nabble.com/Wrong-Q3-Mean-tp4630223.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help at 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.
At 08:22 16/05/2012, Retep32 wrote:>Hi. > > > a > [1] 13 13 14 14 15 15 16 20 21 26 > > summary(a) > Min. 1st Qu. Median Mean 3rd Qu. Max. > 13.0 14.0 15.0 16.7 19.0 26.0 > > mean(a) >[1] 16.7 > > quantile(a) > 0% 25% 50% 75% 100% > 13 14 15 19 26 > >Clearly, this is not right. My Instructor and I have no idea why the program >does that.If you have no idea why R does something you could try reading the documentation which tells you in some detail (in this case) what R is doing. ?quantile>I removed the program from the computer , installed it again and >it still shows the mistake. It is also strange, that I chose "english" as >installlanguage, but the program is in german (my OS is in german).It used English during installation though, right? So it did what you asked.>Pls help, because otherwise i cannot solve any problems with R. > >Using Win7 and R version 2.15.0 (2012-03-30). > >Retep > >-- >View this message in context: >http://r.789695.n4.nabble.com/Wrong-Q3-Mean-tp4630223.html >Sent from the R help mailing list archive at Nabble.com.Michael Dewey info at aghmed.fsnet.co.uk http://www.aghmed.fsnet.co.uk/home.html