you can use _relevel_ to Reorder Levels of Factor.
use ?relevel to get more information.
2006/8/16, T Mu <muster at gmail.com>:> Hi all,
>
> I am using polr(). The resulting coefficients of first levels are always 0.
>
> What to do if I wnat to get the coefficients of the last level 0.
>
> For example, suppose x has 3 levels, 1, 2, 3
>
> probit <- plor(y ~ x, data1, method='probit')
>
> will get coefficients of level 2, 3 of x, but I want coefficients of level
> 1, 2
>
> Thank you,
> Tian
>
> [[alternative HTML version deleted]]
>
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