Re: [R] ordinal variables

2010-06-04 Thread Joris Meys
, 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

Re: [R] ordinal variables

2010-06-04 Thread Iasonas Lamprianou
...@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

Re: [R] ordinal variables

2010-06-03 Thread Iasonas Lamprianou
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

Re: [R] ordinal variables

2010-06-03 Thread Joris Meys
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 -

Re: [R] ordinal variables

2010-06-03 Thread Iasonas Lamprianou
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

Re: [R] ordinal variables

2010-06-03 Thread S Ellison
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

Re: [R] ordinal variables

2010-06-03 Thread Iasonas Lamprianou
...@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