Coba jelasin Conditional cumulants dari Cumulant dalam bahasa sunda dong

The law of total expectation and the law of total variance generalize naturally to conditional cumulants.  The case n = 3, expressed in the language of (central) moments rather than that of cumulants, says

The general result stated below first appéared in 1969 in The Calculation of Cumulants via Conditioning by David R. Brillinger in volume 21 of Annals of the Institute of Statistical Mathematics, pages 215-218.