On Sep 26, 2011, at 5:42 PM, hasan 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
I think this is isomorphic to a question in the last couple of days on
StackOverflow:
http://stackoverflow.com/questions/7536218/how-do-i-take-subsets-of-a-data-frame-according-to-a-grouping-in-r-tricky-aggre/7536610#7536610
(I don't think the -1 score on my tapply solution is exactly fair. but
I suspect that Ari has moved on to other things and is not going back
to check up on edits. I think w=either solution should provide a
random selection within groups.)
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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