Geodesic
On the Nonnegativity of XX* and its Relevance in Econometrics.
Metrika, Tome 32 (1985), pp. 35-47.

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Mots-clés : Moore-Penrose inverse, least squares estimation, linear models, weighted least squares, heteroskedasticity 
@article{MET_1985__32_175984,
     author = {Gerd Ronning},
     title = {On the {Nonnegativity} of {XX*} and its {Relevance} in {Econometrics.}},
     journal = {Metrika},
     pages = {35--47},
     publisher = {mathdoc},
     volume = {32},
     year = {1985},
     zbl = {0558.62099},
     url = {http://geodesic.mathdoc.fr/item/MET_1985__32_175984/}
}
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Gerd Ronning. On the Nonnegativity of XX* and its Relevance in Econometrics.. Metrika, Tome 32 (1985), pp. 35-47. http://geodesic.mathdoc.fr/item/MET_1985__32_175984/