matching from a distribution

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Danielle Leblanc
Danielle Leblanc 2011-7-3
I am a new user and I hope my question is not too sample.
I have a value A=1000; and i have a huge vector B . From B I want to select the observations that : 1. are 10% away from A in either direction (+ and - 10% of A) 2. select the matching values that fall in the same tercile of A (i.e where A falls in the 33.33% of the distribution of the values of B).
How can I do so without writing long programs. I feel a couple of lines by an expert can do the job.
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Danielle Leblanc
Danielle Leblanc 2011-7-3
i edited the question. now it is clearer
Danielle Leblanc
Danielle Leblanc 2011-7-3
i edited the question. now it is clearer

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回答（2 个）

Oleg Komarov
Oleg Komarov 2011-7-3
[I]
idx = B > A + .1*A | B < A + .1*A;
B(idx)
  2 个评论
Danielle Leblanc
Danielle Leblanc 2011-7-3
I think you mean:
idx = B > A - .1*A | B < A + .1*A;
B(idx)
Oleg Komarov
Oleg Komarov 2011-7-4
For A = 1000, your formulation detects B > 900 and B < 1100 which means values in between, but you said away in both directions from A, which I interpret outside of the confidence intervals.

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Danielle Leblanc
Danielle Leblanc 2011-7-4
The solution for the 1st problem proposed by oleg is wrong. I think it should be : idx = B > A - .1*A & B < A + .1*A; B(idx)

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