Thanks David,
I apologize (I did search before posting, but only for "ks.test" and didn't
came a cross references through my uncareful skimming)

Thanks,
Tal


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On Sat, Mar 13, 2010 at 10:04 PM, David Winsemius <dwinsemius@comcast.net>wrote:

>
> On Mar 13, 2010, at 2:34 PM, Tal Galili wrote:
>
>  Hello all,
>>
>> A friend just showed me how ks.test fails to work with pbinom for small
>> "size".
>> Example:
>>
>> x<-rbinom(10000,10,0.5)
>> x2<-rbinom(10000,10,0.5)
>> ks.test(x,pbinom,10,0.5)
>> ks.test(x,pbinom,size = 10, prob= 0.5)
>> ks.test(x,x2)
>>
>>
>> The tests gives significant p values, while the x did come from
>> binom  with size = 10 prob = 0.5.
>>
>
> The first sentence of Details in the ks.test help page:
> "If y is numeric, a two-sample test of the null hypothesis that x and y
> were drawn from the same _continuous_ distribution is performed."
>  (_continuous_ in italics.)
>
> This has come up in r-help so frequently that I nominate it for addition to
> the FAQ. Searching with RSiteSearch() on "ks.test" with "ties" or
> "continuous" should bring up useful commentary from experts.
>
> --
> David.
>
>>
>> What test should I use instead ?
>>
>>
>> Thanks,
>> Tal
>>
>>
>>        [[alternative HTML version deleted]]
>>
>
>
> David Winsemius, MD
> West Hartford, CT
>
>

	[[alternative HTML version deleted]]

