This is valuable material, thanks for all the help. I'll need many days to go through this information
jason Dr. Iasonas Lamprianou Assistant Professor (Educational Research and Evaluation) Department of Education Sciences European University-Cyprus P.O. Box 22006 1516 Nicosia Cyprus Tel.: +357-22-713178 Fax: +357-22-590539 Honorary Research Fellow Department of Education The University of Manchester Oxford Road, Manchester M13 9PL, UK Tel. 0044 161 275 3485 iasonas.lampria...@manchester.ac.uk --- On Fri, 4/6/10, Joris Meys <jorism...@gmail.com> wrote: > From: Joris Meys <jorism...@gmail.com> > Subject: Re: [R] ordinal variables > To: "Iasonas Lamprianou" <lampria...@yahoo.com> > Cc: r-help@r-project.org > Date: Friday, 4 June, 2010, 11:24 > Hi, > > If you look around a bit, there is some great material on > the web > about the powers and quirks of R. I've taught myself most > of what I > know from R through reading a lot and trying it out on the > console. > The help list is also a darn fine source of efficient code > for a set > of general problems. > > It won't help any more this year, but I'm working on a > guide for R to > bundle valuable information I got from the help list and > the internet. > It should be ready in a couple of months, and it will be > available for > all to use. In any case, Owen's guide is of great value for > an > introduction to the command line and basic statistics: > http://cran.r-project.org/doc/contrib/Owen-TheRGuide.pdf > > Also the introduction to R is a must-read for all our > students : > http://cran.r-project.org/doc/manuals/R-intro.pdf > > Next to that, a couple of websites are great additional > sources of code : > Quick-R, a guide for those who come over from > SAS/SPSS/Stata. It > contains tons of examples for statistical analyses in about > every > field. If you didn't know it yet, you'll love it for sure > : > http://www.statmethods.net/ > > The R graph gallery, to show what exactly can be done with > the > graphical power of R : > http://addictedtor.free.fr/graphiques/ > > The R Graphics gallery, doing the same : > http://research.stowers-institute.org/efg/R/ > > There's many more to be found, a whole community of users > is > contributing to the information in various ways. We give > the sources > mentioned here to our students, with the message that they > should > never underestimate the power of Google. > > Last but not least, there is a specific mailing list > regarding > teaching statistics using R: > https://stat.ethz.ch/mailman/listinfo/r-sig-teaching > > You might want to take a look at their archives as well. > > Cheers > Joris > > On Fri, Jun 4, 2010 at 6:39 AM, Iasonas Lamprianou <lampria...@yahoo.com> > wrote: > > Thanks, I'll have a go and will let you know. I guess > that the success has to do with how efficiently I help them > to demonstrate the efficiency of code over menues. So part > of the issue is how I teach them as well... > > > > > > Dr. Iasonas Lamprianou > > > > > > Assistant Professor (Educational Research and > Evaluation) > > Department of Education Sciences > > European University-Cyprus > > P.O. Box 22006 > > 1516 Nicosia > > Cyprus > > Tel.: +357-22-713178 > > Fax: +357-22-590539 > > > > > > Honorary Research Fellow > > Department of Education > > The University of Manchester > > Oxford Road, Manchester M13 9PL, UK > > Tel. 0044 161 275 3485 > > iasonas.lampria...@manchester.ac.uk > > > > > > --- On Thu, 3/6/10, S Ellison <s.elli...@lgc.co.uk> > wrote: > > > >> From: S Ellison <s.elli...@lgc.co.uk> > >> Subject: Re: [R] ordinal variables > >> To: "Joris Meys" <jorism...@gmail.com>, > "Iasonas Lamprianou" <lampria...@yahoo.com> > >> Cc: r-help@r-project.org > >> Date: Thursday, 3 June, 2010, 15:44 > >> If you set them a problem that has > >> them doing the same sort of thing > >> five times and compare the time it takes with code > pasted > >> from an editor > >> (eg Tinn-R) and the time it takes via menius, you > may have > >> more luck > >> convincing them. > >> > >> A command line sequence is harder than menus the > first two > >> times but > >> easier for any n iterations thereafter. > >> > >> Steve ellison > >> > >> >>> Iasonas Lamprianou <lampria...@yahoo.com> > >> 03/06/2010 14:51 >>> > >> Thank you Joris, > >> I'll have a look into the commands you sent me. > They look > >> convincing. I > >> hope my students will also see them in a positive > way > >> (although I can > >> force them to pretend that they have a positive > attitude)! > >> > >> Dr. Iasonas Lamprianou > >> > >> > >> > >> > >> > >> Assistant Professor (Educational Research and > Evaluation) > >> > >> Department of Education Sciences > >> > >> European University-Cyprus > >> > >> P.O. Box 22006 > >> > >> 1516 Nicosia > >> > >> Cyprus > >> > >> Tel.: +357-22-713178 > >> > >> Fax: +357-22-590539 > >> > >> > >> > >> > >> > >> Honorary Research Fellow > >> > >> Department of Education > >> > >> The University of Manchester > >> > >> Oxford Road, Manchester M13 9PL, UK > >> > >> Tel. 0044 161 275 3485 > >> > >> iasonas.lampria...@manchester.ac.uk > >> > >> > >> --- On Thu, 3/6/10, Joris Meys <jorism...@gmail.com> > >> wrote: > >> > >> From: Joris Meys <jorism...@gmail.com> > >> Subject: Re: [R] ordinal variables > >> To: "Iasonas Lamprianou" <lampria...@yahoo.com> > >> Cc: r-help@r-project.org > >> > >> Date: Thursday, 3 June, 2010, 14:35 > >> > >> see ?factor and ?as.factor. On ordered factors you > can > >> technically do a > >> spearman without problem, apart from the fact that > a > >> spearman test by > >> definition cannot give exact p-values with ties > present. > >> > >> x <- > sample(c("a","b","c","d","e"),100,replace=T) > >> > >> y <- > sample(c("a","b","c","d","e"),100,replace=T) > >> > >> x.ordered <- > >> factor(x,levels=c("e","b","a","d","c"),ordered=T) > >> > >> x.ordered > >> y.ordered <- > >> factor(y,levels=c("e","b","a","d","c"),ordered=T) > >> y.ordered > >> > >> cor.test(x.ordered,y.ordered,method="spearman") > >> > >> require(pspearman) > >> > >> spearman.test(x.ordered,y.ordered) > >> > >> R commander has some menu options to deal with > factors. R > >> commander > >> also provides a scripting window. Please do your > students a > >> favor, and > >> show them how to use those commands. > >> > >> > >> Cheers > >> Joris > >> > >> > >> On Thu, Jun 3, 2010 at 2:25 PM, Iasonas > Lamprianou > >> <lampria...@yahoo.com> > >> wrote: > >> > >> Dear colleagues, > >> > >> > >> > >> I teach statistics using SPSS. I want to use R > instead. I > >> hit on one > >> problem and I need some quick advice. When I want > to work > >> with ordinal > >> variables, in SPSS I can compute the median or > create a > >> barchart or > >> compute a spearman correlation with no problems. > In R, if I > >> "read" the > >> ordinal variable as numeric, then I cannot do a > barplot > >> because I miss > >> the category names. If I read the variables as > characters, > >> then I cannot > >> run a spearman. How can I read a variable as > numeric, still > >> have the > >> chance to assign value labels, and be able to get > table of > >> frequencies > >> etc? I want to be able to do all these things in > R > >> commander. My > >> students will probable be scared away if I try > anything > >> else other than > >> R commander (just writing commands will not make > them > >> happy). > >> > >> > >> > >> > >> I hope I am not asking for too much. Hopefully > there is a > >> way > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> ______________________________________________ > >> > >> 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. > >> > >> > >> > >> > >> -- > >> Joris Meys > >> Statistical Consultant > >> > >> Ghent University > >> Faculty of Bioscience Engineering > >> Department of Applied mathematics, biometrics and > process > >> control > >> > >> > >> Coupure Links 653 > >> B-9000 Gent > >> > >> tel : +32 9 264 59 87 > >> joris.m...@ugent.be > >> > >> ------------------------------- > >> Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php > >> > >> > >> > >> > >> > >> > >> [[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. > >> > >> > ******************************************************************* > >> This email and any attachments are confidential. > Any use, > >> copying or > >> disclosure other than by the intended recipient > is > >> unauthorised. If > >> you have received this message in error, please > notify the > >> sender > >> immediately via +44(0)20 8943 7000 or notify postmas...@lgc.co.uk > >> > >> and delete this message and any copies from your > computer > >> and network. > >> LGC Limited. Registered in England 2991879. > >> Registered office: Queens Road, Teddington, > Middlesex, TW11 > >> 0LY, UK > >> > > > > > > > > > > > > -- > Ghent University > Faculty of Bioscience Engineering > Department of Applied mathematics, biometrics and process > control > > tel : +32 9 264 59 87 > joris.m...@ugent.be > ------------------------------- > Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php > ______________________________________________ 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.
