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
>
> -------------------------------
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