[R] Kolmogorov smirnov test

[Moshe Olshansky]

Hi Roslina,

I believe that you can ignore the warning.
Alternatively, you may add a very small random noise to pairs with ties, i.e. something like
xobs[which(duplicated(xobs))] <- xobs[which(duplicated(xobs))] + 1.0e-6*sd(xobs)*rnorm(length(which(duplicated(xobs))))

Regards,

Moshe.

--- On Tue, 13/10/09, Roslina Zakaria <zroslina at yahoo.com> wrote:

> From: Roslina Zakaria <zroslina at yahoo.com>
> Subject: [R] Kolmogorov smirnov test
> To: r-help at r-project.org
> Received: Tuesday, 13 October, 2009, 9:58 AM
> 
> Hi r-users,
>  
> I would like to use Kolmogorov smirnov test but in my
> observed data(xobs) there are ties.  I got the warning
> message.  My question is can I do something about it?
>  
> ks.test(xobs, xsyn)
>  
>         Two-sample Kolmogorov-Smirnov test
> data:  xobs and xsyn 
> D = 0.0502, p-value = 0.924
> alternative hypothesis: two-sided 
> 
> Warning message:
> In ks.test(xobs, xsyn) : cannot compute correct p-values
> with ties
>  
> Thank you for all your help.
> 
> 
> 
>       
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> 
> 
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