[R] Randomly selecting rows with unique values in two columns

[R. Michael Weylandt <michael.weylandt@gmail.com>]

It sounds like you've already done the hard(er) part: just use sample(nrow, noWanted) now to pick which rows to select. 

Michael Weylandt

On Sep 26, 2011, at 5:42 PM, hasan <halhaddad at ucdavis.edu> wrote:

> Hello,
> 
> I am trying to randomly select rows with unique values in columns 1 and 2. I
> want to generate multiple subsets to estimate a statistic for each data set.
> Below is a simplified example.
> 
>   L1 L2 L3 L4 L5
> 1   a  b  1  2  3
> 2   a  c  4  5  6
> 3   a  d  7  8  9
> 4   a  e 10 11 12
> 5   a  f 13 14 15
> 6   b  c 16 17 18
> 7   b  d 19 20 21
> 8   b  e 22 23 24
> 9   b  f 25 26 27
> 10  c  d 28 29 30
> 11  c  e 31 32 33
> 12  c  f 34 35 36
> 13  d  e 37 38 39
> 14  d  f 40 41 42
> 15  e  f 43 44 45
> 
> Could you please give directions to where to start? I have tried eliminating
> duplicates and finding unique rows but no successful to make it random.
> 
> Thanks
> 
> Hasan
> 
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