Distribució lambda de Wilks

Infotaula distribució de probabilitatDistribució lambda de Wilks
Tipusdistribució univariant Modifica el valor a Wikidata
EpònimSamuel Wilks Modifica el valor a Wikidata

En estadística, la distribució lambda de Wilks (anomenada així en honor de Samuel S. Wilks), és una distribució de probabilitat utilitzada en proves d'hipòtesis multivariants, especialment pel que fa a la prova de la raó de versemblança i l'anàlisi multivariada de variància (MANOVA). És una generalització multivariant de la distribució F univariant, de manera anàloga a la generalització de la distribució T-quadrat de Hotelling respecte a la distribució t de Student.

La distribució lambda de Wilks està relacionada amb dues variables independents distribuïdes segons la distribució de Wishart, i es defineix com segueix:[1]

Donat:

independents i amb mp

on p és el nombre de dimensions. En el context de les proves de la raó de versemblança m és típicament els graus de llibertat de l'error, i n és el grau de llibertat de la hipòtesi, per la qual cosa n + m és el nombre total de graus de llibertat.[1]

La distribució es pot relacionar amb un producte de variables aleatòries independents que segueixen una distribució beta.

Per valors de m grans, l'aproximació de Bartlett[2] permet aproximar la distribució lambda de Wilks a una distribució khi quadrat:[1]

Vegeu també

Referències

  1. 1,0 1,1 1,2 Mardia, K. V.; Kent, J. T.; Bibby, J. M. Multivariate Analysis. Londres: Academic Press, 1979. ISBN 0-12-471250-9. 
  2. Barlett, M. S «A Note on the Multiplying Factors for Various chi-square Approximations». J. Roy. Stat. Soc. Series B, 16, (2), 1954, pàg. 296 - 298. JSTOR: 2984057.

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