[R] dixon test

[giov]

Thank you so much, I have not much experience on outliers =), I thought that
there were nonparametric distribution-free outliers test =(. What is the
most general distribution  I can use? I did histogram of my data set and
sometimes normal distribution seems to occur, sometimes an uniform
distribution seems to occur. So, I cannot understand what distribution I can
use for my whole data set....



S Ellison wrote:
> 
> 
> 
>>>> giov <biowoman at libero.it> 13/08/2008 10:59:32 >>>
> 
>> just a question...I don't know
>>what is the distribution of my data (normal, T, etc...). So, how can I
> set
>>the type parameter? 
> 
> You must assume an underlying distribution or you can't do an outlier
> test.
> 
> Outliers are just unusually extreme data points. They can only be
> considered 'unusual' if there is some basis - a distribution assumption
> - for deciding what is 'usual'.  The assumed underlying distribution
> describes what is expected to be 'usual'. 
> 
> With no distribution assumption, there is no basis for considering any
> data point unusual, so the idea of an outlier really has no meaning. 
> 
> Steve E
> 
> 
> 
> 
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