[R] How to draw an observation uniformly from a given dataset?
David Forrest
drf5n at maplepark.com
Wed Sep 8 23:32:40 CEST 2004
On Wed, 8 Sep 2004 wanr at ucalgary.ca wrote:
> Hi all,
>
> I have two questions stated below:
>
> 1. How to draw an observation uniformly from a given data?
>
> For example, I have a dataset (or dataframe) with 10 observations (with a
> set of variables) and I want to "uniformly" select an observation from this
> given dataset, that is, the probability of selecting each observation is
> 1/10.
sample(1:10,3,replace=TRUE)
>
> 2. How to do this "combinations"?
>
> source vector = (1,2)
> the length of the target vector = 3
>
> My expected outputs should be:
> 111, 112, 121, 122, 211, 212, 221, 222.
sample(c(1,2),3,replace=TRUE)
Dave
--
Dave Forrest
drf at vims.edu (804)684-7900w
drf5n at maplepark.com (804)642-0662h
http://maplepark.com/~drf5n/
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