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{{context|date=February 2012}}
In [[information theory]], '''dual total correlation''' (Han 1978) or excess entropy (Olbrich 2008) is one of the two known non-negative generalizations of [[mutual information]]. While [[total correlation]] is bounded by the sum entropies of the ''n'' elements, the dual total correlation is bounded by the joint-entropy of the ''n'' elements. Although well behaved, dual total correlation has received much less attention than the total correlation. A measure known as "TSE-complexity" defines a continuum between the total correlation and dual total correlation (Ay 2001).
 
==Definition==
For a set of ''n'' [[random variable]]s <math>\{X_1,\ldots,X_n\}</math>, the dual total correlation <math>D(X_1,\ldots,X_n)</math> is given by
 
:<math> D(X_1,\ldots,X_n) = H\left( X_1, \ldots, X_n \right) - \sum_{i=1}^n H\left( X_i | X_1, \ldots, X_{i-1}, X_{i+1}, \ldots, X_n \right) ,</math>
 
where <math>H(X_{1},\ldots,X_{n})</math> is the [[joint entropy]] of the variable set <math>\{X_{1},\ldots,X_{n}\}</math> and <math>H(X_{i}| ... )</math> is the [[conditional entropy]] of variable <math>X_{i}</math>, given the rest.
 
==Normalized==
The dual total correlation normalized between [0,1] is simply the dual total correlation divided by its maximum value <math>H(X_{1}, \ldots, X_{n})</math>,
 
:<math>ND(X_1,\ldots,X_n) = \frac{D(X_1,\ldots,X_n)}{H(X_1,\ldots,X_n)} .</math>
 
==Bounds==
Dual total correlation is non-negative and bounded above by the joint entropy <math>H(X_1, \ldots, X_n)</math>.
 
:<math> 0 \leq D(X_1, \ldots, X_n) \leq H(X_1, \ldots, X_n) .</math>
 
Secondly, Dual total correlation has a close relationship with total correlation, <math>C(X_1, \ldots, X_n)</math>.  In particular,
 
:<math> \frac{C(X_1, \ldots, X_n)}{n-1} \leq D(X_1, \ldots, X_n) \leq (n-1) \; C(X_1, \ldots, X_n) .</math>
 
==History==
Han (1978) originally defined the dual total correlation as,
: <math>
\begin{align}
& {} \qquad  D(X_1,\ldots,X_n) \\[10pt]
& \equiv \left[ \sum_{i=1}^n H(X_1, \ldots, X_{i-1}, X_{i+1}, \ldots, X_n ) \right] - (n-1) \; H(X_1, \ldots, X_n) \; .
\end{align}
</math>
However Abdallah and Plumbley (2010) showed its equivalence to the easier-to-understand form of the joint entropy minus the sum of conditional entropies via the following:
 
: <math>
\begin{align}
& {} \qquad  D(X_1,\ldots,X_n) \\[10pt]
& \equiv \left[ \sum_{i=1}^n H(X_1, \ldots, X_{i-1}, X_{i+1}, \ldots, X_n ) \right] - (n-1) \; H(X_1, \ldots, X_n) \\
& = \left[ \sum_{i=1}^n H(X_1, \ldots, X_{i-1}, X_{i+1}, \ldots, X_n ) \right] + (1-n) \; H(X_1, \ldots, X_n) \\
& = H(X_1, \ldots, X_n) + \left[ \sum_{i=1}^n H(X_1, \ldots, X_{i-1}, X_{i+1}, \ldots, X_n ) - H(X_1, \ldots, X_n) \right] \\
& = H\left( X_1, \ldots, X_n \right) - \sum_{i=1}^n H\left( X_i | X_1, \ldots, X_{i-1}, X_{i+1}, \ldots, X_n \right)\; .
\end{align}
</math>
 
==See also==
*[[Mutual information]]
*[[Total correlation]]
 
{{no footnotes|date=June 2011}}
 
==References==
* Han T. S. (1978). Nonnegative entropy measures of multivariate symmetric correlations, ''Information and Control'' '''36''', 133&ndash;156.
* Fujishige Satoru (1978). Polymatroidal Dependence Structure of a Set of Random Variables, ''Information and Control'' '''39''', 55&ndash;72. {{doi|10.1016/S0019-9958(78)91063-X}}.
* Olbrich, E. and Bertschinger, N. and Ay, N. and Jost, J. (2008).  How should complexity scale with system size?, ''The European Physical Journal B - Condensed Matter and Complex Systems''. {{doi|10.1140/epjb/e2008-00134-9}}.
* Abdallah S. A. and Plumbley, M. D. (2010). A measure of statistical complexity based on predictive information, ''ArXiv e-prints''. {{arxiv|1012.1890v1}}.
 
* Nihat Ay, E. Olbrich, N. Bertschinger (2001). A unifying framework for complexity measures of finite systems.  European Conference on Complex Systems. [http://www.cabdyn.ox.ac.uk/complexity_PDFs/ECCS06/Conference_Proceedings/PDF/p202.pdf pdf].
 
[[Category:Information theory]]
[[Category:Probability theory]]
[[Category:Statistical dependence]]

Revision as of 10:40, 13 January 2014

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Here is my web site; http://Www.hostgator1centcoupon.info/ (support.file1.com) In information theory, dual total correlation (Han 1978) or excess entropy (Olbrich 2008) is one of the two known non-negative generalizations of mutual information. While total correlation is bounded by the sum entropies of the n elements, the dual total correlation is bounded by the joint-entropy of the n elements. Although well behaved, dual total correlation has received much less attention than the total correlation. A measure known as "TSE-complexity" defines a continuum between the total correlation and dual total correlation (Ay 2001).

Definition

For a set of n random variables , the dual total correlation is given by

where is the joint entropy of the variable set and is the conditional entropy of variable , given the rest.

Normalized

The dual total correlation normalized between [0,1] is simply the dual total correlation divided by its maximum value ,

Bounds

Dual total correlation is non-negative and bounded above by the joint entropy .

Secondly, Dual total correlation has a close relationship with total correlation, . In particular,

History

Han (1978) originally defined the dual total correlation as,

However Abdallah and Plumbley (2010) showed its equivalence to the easier-to-understand form of the joint entropy minus the sum of conditional entropies via the following:

See also

Template:No footnotes

References

  • Han T. S. (1978). Nonnegative entropy measures of multivariate symmetric correlations, Information and Control 36, 133–156.
  • Fujishige Satoru (1978). Polymatroidal Dependence Structure of a Set of Random Variables, Information and Control 39, 55–72. 21 year-old Glazier James Grippo from Edam, enjoys hang gliding, industrial property developers in singapore developers in singapore and camping. Finds the entire world an motivating place we have spent 4 months at Alejandro de Humboldt National Park..
  • Olbrich, E. and Bertschinger, N. and Ay, N. and Jost, J. (2008). How should complexity scale with system size?, The European Physical Journal B - Condensed Matter and Complex Systems. 21 year-old Glazier James Grippo from Edam, enjoys hang gliding, industrial property developers in singapore developers in singapore and camping. Finds the entire world an motivating place we have spent 4 months at Alejandro de Humboldt National Park..
  • Abdallah S. A. and Plumbley, M. D. (2010). A measure of statistical complexity based on predictive information, ArXiv e-prints. Template:Arxiv.
  • Nihat Ay, E. Olbrich, N. Bertschinger (2001). A unifying framework for complexity measures of finite systems. European Conference on Complex Systems. pdf.