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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 221<br />

✬<br />

✫<br />

Pogojne porazdelitve<br />

Naj bo B nek mogoč dogodek, tj. P (B) > 0. Potem lahko vpeljemo<br />

pogojno porazdelitveno funkcijo<br />

F (x | B) = P (X < x | B) =<br />

P (X < x, B)<br />

P (B)<br />

V diskretnem primeru je: pik = P (X = xi, Y = yk), B = (Y = yk) in<br />

P (B) = P (Y = yk) = qk. Tedaj je pogojna porazdelitvena funkcija<br />

FX(x | yk) = FX(x | Y = yk) = P (X < x | Y = yk) =<br />

= P (X < x, Y = yk)<br />

=<br />

P (Y = yk)<br />

1 <br />

pik<br />

qk<br />

xi

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