Révisi nurutkeun 7 Séptémber 2004 10.41 édit Budhi (obrolan \| kontribusi) 5.857 suntingan →‎Moments ← Éditan saméméhna		Révisi nurutkeun 17 Séptémber 2004 00.41 édit bolaykeun Budhi (obrolan \| kontribusi) 5.857 suntingan →‎Momen Éditan salajengna →
Baris ka-42: === Momen === Sebaran probabiliti variabel random salawasna dicirikeun ku jumlah paramater nu saeutik, oge mibanda ''interpretasi'' praktis. Contona, ieu cukup dipikanyaho salaku "nilai average". Hal ieu kawengku ku konsep matematik [[~~expected value\|~~nilai ekspektasi]] variabel random, dilambangkeun ku E[''X'']. Catetan yen ilaharna , E[''f''(''X'')] '''teu''' sarua jeung ''f''(E[''X'']). Mangsa "nilai average" dipikanyaho, mangka sabaraha jauh tipikal nilai ''X'' tina nilai average, patarosan ieu dijawab ku [[varian]] sarta [[simpangan baku]] variabel random. Mathematically, this is known as the (generalised) [[problem of moments]]: for a given class of random variables ''X'', find a collection {''f<sub>i</sub>''} of functions such that the expectation values E[''f<sub>i</sub>''(''X'')] fully characterize the distribution of the random variable ''X''.

Variabel acak: Béda antarrépisi