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Project Description

Description

P4J is a python package for period detection on irregularly sampled and heteroscedastic time series based on Information Theoretic objective functions. P4J was developed for astronomical light curves, irregularly sampled time series of stellar magnitude or flux. The core of this package is a class called periodogram that sweeps an array of periods/frequencies looking for the one that maximizes a given criteria. The main contribution of this work is a criterion for period detection based on the maximization of Cauchy-Schwarz Quadratic Mutual Information [1]. Information theoretic criteria incorporate information on the whole probability density function of the process and are more robust than classical second-order statistics based criteria [2, 3, 4]. For comparison P4J also incorporates classical methods for period detection used in astronomy such as Phase Dispersion Minimization [5] and Lafler-Kinman’s string length [6].

Contents

  • Quadratic Mutual Information periodogram for light curves
  • Phase Dispersion Minimization and String Length methods
  • Basic synthetic light curve generator

Instalation

pip install P4J

Example

https://github.com/phuijse/P4J/blob/master/examples/periodogram_demo.ipynb

TODO

  • Multidimensional time series support
  • More period detection criteria (Conditional Entropy)

Authors

  • Pablo Huijse pablo.huijse@gmail.com (Millennium Institute of Astrophysics and Universidad de Chile)
  • Pavlos Protopapas (Harvard Institute of Applied Computational Sciences)
  • Pablo A. Estévez (Millennium Institute of Astrophysics and Universidad de Chile)
  • Pablo Zegers (Universidad de los Andes, Chile)
  • José C. Príncipe (University of Florida)

(P4J = Four Pablos and one Jose)

References

  1. José C. Príncipe, “Information Theoretic Learning: Renyi’s Entropy and Kernel Perspectives”, Springer, 2010
  2. Pavlos Protopapas et al., “A Novel, Fully Automated Pipeline for Period Estimation in the EROS 2 Data Set”, The Astrophysical Journal Supplement, vol. 216, n. 2, 2015
  3. Pablo Huijse et al., “Computational Intelligence Challenges and Applications on Large-Scale Astronomical Time Series Databases”, IEEE Mag. Computational Intelligence, vol. 9, n. 3, pp. 27-39, 2014
  4. Pablo Huijse et al., “An Information Theoretic Algorithm for Finding Periodicities in Stellar Light Curves”, IEEE Trans. Signal Processing vol. 60, n. 10, pp. 5135-5145, 2012
  5. R. F. Stellingwerf, “Period determination using phase dispersion minimization”, The Astrophysical Journal, vol. 224, pp. 953-960, 1978
  6. D. Clarke, “String/Rope length methods using the Lafler-Kinman statistic”, Astronomy & Astrophysics, vol. 386, n. 2, pp. 763-774, 2002
Release History

Release History

0.22

This version

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0.13

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0.12

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0.11

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0.10

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0.9

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0.8

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0.7

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0.6

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0.5

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0.4

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0.3

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P4J-0.22.tar.gz (415.6 kB) Copy SHA256 Checksum SHA256 Source May 22, 2017

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