Variabel acak: Béda antarrépisi
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'''Variabel acak''' bisa disebut hasil operasi analisa numerik non-deterministik atawa "nga-bentuk" percobaan non deterministik keur ngahasilkeun hasil [[random|acak]]. Conto, ngagorolongkeun duit receh jeung ngarekam hasilna dina variabel random nu hasilna { 1, 2, 3, 4, 5, 6 }. Milih jalma sacara acak jeung ukur jangkungna ngarupakeun conto sejen tina variabel acak.
Sacara matematik, variabel acak diartikeun hiji [[measurable function|fungsi ukuran]] tina [[probability space|rohangan probabiliti]] keur [[aljabar sigma|ukuran rohangan]]. Ukuran rohangan nyaeta nilai variabel ruang nu mungkin, umumna dicokot keur dijadikeun [[real number|wilangan riil]] nu mibanda [[Borel algebra|Borel
=== Fungsi Distribusi ===
Lamun variabel acak ''X'':
Sakabeh rekaman rentang hasil kamungkinan tina nilai-real variabel random ''X'' bakal ngahasilkeun [[probability distribution|sebaran probabilitas]] ''X''. Sebaran kamungkinan "poho" ngeunaan bagean ruang probabiliti dipake keur ngartikeun ''X'' jeung ngan direkam dina variasi nilai ''X''. Saperti sebaran kamngkinan salawasna kawengku dina [[cumulative distribution function|fungsi kumulatif sebaran]]
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:<math>F_X(x) = \operatorname{P}(X < x)</math>
sarta kadangkala make oge [[probability density function|fungsi probabilitas densitas]]. Dina watesan [[measure theory|teori ukuran]], dipake variabel acak ''X'' keur "dorong-hareup" ukuran ''P'' dina
Dina kaayaan ruang probabiliti
=== Fungsi variabel acak ===
Lamun urang ngabogaan variabel random ''X'' on
Fungsi sebaran kumulatif ''Y'' nyaeta
:<math>F_Y(y) = \operatorname{P}(f(X) < y).</math>
==== Conto ====
Anggap ''X'' nilai-riil variabel acak sarta anggap ''Y'' = ''X''<sup>2</sup>. Mangka,
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:<math>F_Y(y) = \operatorname{P}(X^2 < y).</math>
Lamun ''y'' < 0, mangka P(''X''<sup>2</sup>
:<math>F_Y(y) = 0\qquad\hbox{if}\quad y < 0.</math>
Lamun ''y''
:<math>\operatorname{P}(X^2 < y) = \operatorname{P}(|X| < \sqrt{y})
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==== Sarua dina mean ====
Dua variabel acak ''X'' jeung ''Y'' ''sarua dina mean ka-p'' lamun momen ka-''p'' |''X''
:<math>\operatorname{E}(|X-Y|^p) = 0.</math>
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=== Conto ===
Di handap ieu ngarupakeun conto tina integer random i, 1
17 12 17 89 64
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=== Tempo ogé ===
* [[discrete random variable]], [[continuous random variable]], [[probability distribution]], [[randomness]], [[random vector]], [[random function]], [[generating function]]
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[[scn:Variabbili aliatoria]]
[[simple:Random variable]]
[[sl:Slučajna spremenljivka]]
[[sv:Stokastisk variabel]]
[[tr:Rassal değişken]]
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