(no subject)

Thanks Peter
The data have no resemblance to what prop.trend.test expects (counts and totals, optionally group scores).

The prop.trend.test() function tests for trend in proportions. Were you attempting a rank correlation, or maybe a rank sum (Wilcoxon type) test against a directional alternative? (I'm not too sure, but package "coin" might have the latter).

-pd

On 15 Jan 2014, at 07:30 , Keniajin Wambui <kiangati at gmail.com> wrote:

I am using R3.02 on WIndows 7 64bit.
How can I test for trend across ordered groups. I am using
`prop.trend.test` but it doesn't order into groups and doesn't give
the expected output of `sum of ranks` , `z value`...

I have this data set and am doing

   `prop.trend.test (birthweight2$lbw2 ,birthweight2$gestwkgp2 )`

Here is a sample data
   lbw2          gestwkgp
   normal birth weight    3
   normal birth weight    3
   normal birth weight    3
   normal birth weight    4
   normal birth weight    3
   normal birth weight    3
   normal birth weight    3
   normal birth weight    4
   low birth weight    2
   normal birth weight    4

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