[R] Drawing from an empirical distribution

[roger koenker]

Sure, but it would be more 'fun' to modify ecdf() slightly to produce
an ecqf()  function -- essentially reversing the arguments to  
approxfun()--
and then use

	ecqf(runif(whatever))

no nit-picking about efficiency, please.


url:    www.econ.uiuc.edu/~roger            Roger Koenker
email    rkoenker at uiuc.edu            Department of Economics
vox:     217-333-4558                University of Illinois
fax:       217-244-6678                Champaign, IL 61820



On Jan 6, 2009, at 4:42 PM, Antonio, Fabio Di Narzo wrote:

> If the ecdf is 'ecdf(x)', do just:
>> sample(x, size=whatever, replace=TRUE)
>
> HTH,
> Antonio.
>
> 2009/1/6 culpritNr1 <ig2ar-saf1 at yahoo.co.uk>:
>>
>> Hi All,
>>
>> Does anybody know if there is a simple way to draw numbers from an  
>> empirical
>> distribution?
>>
>> I know that I can plot the empirical cumulative distribution  
>> function this
>> easy:
>> plot(ecdf(x))
>>
>> Now I want to pick a number between 0 and 1 and go back to domain  
>> of x.
>> Sounds simple to me.
>>
>> Any suggestion?
>>
>> Thank you,
>>
>> Your culprit
>> (everybody needs a culprit)
>>
>>
>> --
>> View this message in context: http://www.nabble.com/Drawing-from-an-empirical-distribution-tp21320810p21320810.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
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>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
>
> -- 
> Antonio, Fabio Di Narzo
> Ph.D. student at
> Department of Statistical Sciences
> University of Bologna, Italy
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.