Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nearest neighbor vector analysis of sdss dr5 galaxy distribution   We present the Nearest Neighbor Distance (NND) analysis of SDSS DR5 galaxies.
We give NND results for observed, mock and random sample, and discuss the
differences. We find that the observed sample gives us a significantly stronger
aggregation characteristic than the random samples. Moreover, we investigate
the direction of NND and find that the direction has close relation with the
size of the NND for the observed sample.

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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: physics
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: adap-org
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
34
The categories of this paper are: chem-ph