[R] (no subject)

peter dalgaard pdalgd at gmail.com
Wed Jan 15 17:23:13 CET 2014


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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Peter Dalgaard, Professor
Center for Statistics, Copenhagen Business School
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Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com




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