[R] sample function with different proportions

[Duncan Murdoch]

On 05/07/2011 2:25 PM, Joshua Wiley wrote:
> Hi Ana,
>
> Look at the documentation for ?sample, specifically, the "prob"
> argument.  In your case this should work:
>
> sample(c(0,1), 100, replace = TRUE, prob = c(.3, .7))
>
> note that you may not have *exactly* 70% 1 and 30%, in any given sample.

And if you want exact counts, you can use sample to permute a vector.  
For example:

sample(rep(0:1, c(30, 70)))

Duncan Murdoch

> HTH,
>
> Josh
>
> On Tue, Jul 5, 2011 at 11:21 AM, Ana Kolar<annakolar at yahoo.com>  wrote:
> >  Hi there,
> >
> >  I guess this is an easy one, but still:
> >
> >  I would like to randomly sample 0s and 1s but in a way that I end up having for example 70% of 1s and the rest of 0s and not 50:50 as this function does: sample(c(0,1), 100, replace = TRUE)
> >
> >  Any recommendations?
> >
> >
> >  Many thanks!
> >
> >  Ana
> >          [[alternative HTML version deleted]]
> >
> >
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>
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