Journal
JOURNAL OF DAIRY SCIENCE
Volume 86, Issue 2, Pages 677-679Publisher
AMER DAIRY SCIENCE ASSOC
DOI: 10.3168/jds.S0022-0302(03)73646-7
Keywords
genetic correlation matrix; covariance matrices; weighted bending
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Due to computational demand, elements of genetic correlation matrices may have been estimated separately and then combined together into a single correlation matrix at a later stage. Because these matrices should be positive definite (PD) a statistical method commonly known as bending is used to make them positive definite. The conventional bending method ignores the reliability of different correlations and may subject; any of them to change in order to make a positive definite correlation matrix. A simple method to obtain a weighted bended matrix to be used in animal breeding applications is proposed, and the implementation of the method is demonstrated by an example.
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