[R] polr?

[Prof Brian Ripley]

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_x1
> 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!
>
> daniel
>
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>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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