Prof Brian Ripley
ripley at stats.ox.ac.uk
Thu Jul 4 14:14:03 CEST 2013
On 04/07/2013 12:59, Dániel Kehl wrote:
> Dear R users,
> I have a dataset with two ordered variables, tr_x1 and tr_y1. A crosstable of them can bee seen below.
> tr_y1 -1 0 1
> -1 629 100 629
> 0 1396 4353 1443
> 1 668 126 655
> It is clear that if tr_x1 is 0, it has an effect on tr_y1. A chi-square statistic is clearly showing this with a low p-value.
> Is there a regression-based method you would offer? I tried polr from MASS package but without finding a significant coefficient, because the columns for tr_x1 and tr_y1 are similar.
Your mistake is testing coefficients, not overall fit.
> Thank you for your help!
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Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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