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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 185<br />

✬<br />

Slučajni vektor je n-terica slučajnih spremenljivk X = (X1, . . . , Xn).<br />

Opiˇsemo ga s porazdelitveno funkcijo (xi ∈ R)<br />

✫<br />

F (x1, . . . , xn) = P (X1 < x1, . . . , Xn < xn),<br />

pri čemer slednja oznaka pomeni P {X1 < x1} ∩ . . . ∩ {Xn < xn} ,<br />

in za katero velja: 0 ≤ F (x1, . . . , xn) ≤ 1<br />

Funkcija F je za vsako spremenljivko naraˇsčajoča in od leve zvezna.<br />

F (−∞, . . . , −∞) = 0 in F (∞, . . . , ∞) = 1 .<br />

Funkciji Fi(xi) = F (∞, . . . , ∞, xi, ∞, . . . , ∞) pravimo<br />

robna porazdelitvena funkcija spremenljivke Xi.<br />

Univerza v Ljubljani ▲<br />

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● ❙ ▲<br />

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☛ ✖<br />

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✩<br />

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