Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Fast Chi-squared Technique For Period Search of Irregularly Sampled
  Data   A new, computationally- and statistically-efficient algorithm, the Fast
$\chi^2$ algorithm, can find a periodic signal with harmonic content in
irregularly-sampled data with non-uniform errors. The algorithm calculates the
minimized $\chi^2$ as a function of frequency at the desired number of
harmonics, using Fast Fourier Transforms to provide $O (N \log N)$ performance.
The code for a reference implementation is provided.

36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
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The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
2
The categories of this paper are: math