Mishra, SK (2007): Completing correlation matrices of arbitrary order by differential evolution method of global optimization: A Fortran program.
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Abstract
Correlation matrices have many applications, particularly in marketing and financial economics. The need to forecast demand for a group of products in order to realize savings by properly managing inventories requires the use of correlation matrices.
In many cases, due to paucity of data/information or dynamic nature of the problem at hand, it is not possible to obtain a complete correlation matrix. Some elements of the matrix are unknown. Several methods exist that obtain valid complete correlation matrices from incomplete correlation matrices. In view of nonunique solutions admissible to the problem of completing the correlation matrix, some authors have suggested numerical methods that provide ranges to different unknown elements. However, they are limited to very small matrices up to order 4.
Our objective in this paper is to suggest a method (and provide a Fortran program) that completes a given incomplete correlation matrix of an arbitrary order. The method proposed here has an advantage over other algorithms due to its ability to present a scenario of valid correlation matrices that might be obtained from a given incomplete matrix of an arbitrary order. The analyst may choose some particular matrices, most suitable to his purpose, from among those output matrices. Further, unlike other methods, it has no restriction on the distribution of holes over the entire matrix, nor the analyst has to interactively feed elements of the matrix sequentially, which might be quite inconvenient for larger matrices. It is flexible and by merely choosing larger population size one might obtain a more exhaustive scenario of valid matrices. Moreover, the Differential Evolution algorithm is amenable to parallelization.
Item Type:  MPRA Paper 

Institution:  NorthEastern Hill University, Shillong (India) 
Original Title:  Completing correlation matrices of arbitrary order by differential evolution method of global optimization: A Fortran program 
Language:  English 
Keywords:  Incomplete; complete; correlation matrix; valid; semidefinite; eigenvalues; Differential Evolution; global optimization; computer program; fortran; financial economics; arbitrary order 
Subjects:  G  Financial Economics > G1  General Financial Markets > G10  General C  Mathematical and Quantitative Methods > C8  Data Collection and Data Estimation Methodology ; Computer Programs > C88  Other Computer Software C  Mathematical and Quantitative Methods > C6  Mathematical Methods ; Programming Models ; Mathematical and Simulation Modeling > C63  Computational Techniques ; Simulation Modeling C  Mathematical and Quantitative Methods > C6  Mathematical Methods ; Programming Models ; Mathematical and Simulation Modeling > C61  Optimization Techniques ; Programming Models ; Dynamic Analysis 
Item ID:  31282 
Depositing User:  Sudhanshu Kumar Mishra 
Date Deposited:  06 Jun 2011 07:45 
Last Modified:  30 Aug 2017 21:30 
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URI:  https://mpra.ub.unimuenchen.de/id/eprint/31282 
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Completing correlation matrices of arbitrary order by differential evolution method of global optimization: A Fortran program. (deposited 05 Mar 2007)
 Completing correlation matrices of arbitrary order by differential evolution method of global optimization: A Fortran program. (deposited 06 Jun 2011 07:45) [Currently Displayed]