Abstract
THE problem of ‘inverting’ singular matrices is by no means uncommon in statistical analysis. Rao1 has shown in a lemma that a generalized inverse (g-inverse) always exists, although in the case of a singular matrix it may not be unique.
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References
Rao, C. R., J. Roy. Statist. Soc., B, 24 (1), 152 (1962).
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KOOP, J. Generalized Inverse of a Singular Matrix. Nature 198, 1019–1020 (1963). https://doi.org/10.1038/1981019b0
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DOI: https://doi.org/10.1038/1981019b0
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