matching from a distribution

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Danielle Leblanc 2011-7-3

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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 2011-7-3

i edited the question. now it is clearer

Danielle Leblanc 2011-7-3

i edited the question. now it is clearer

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回答（2 个）

Oleg Komarov 2011-7-3

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在 MATLAB Online 中打开

[I]

idx = B > A + .1*A | B < A + .1*A;
B(idx)

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Danielle Leblanc 2011-7-3

I think you mean:

idx = B > A - .1*A | B < A + .1*A;

B(idx)

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 2011-7-4