I'm looking after $E[S^3]$ where $S$ is a compound negative binomial.
Is there a general formula to calculate $E[S^3]$ like $E[S] = E[X]*E[N]$ ?
I'm looking after $E[S^3]$ where $S$ is a compound negative binomial.
Is there a general formula to calculate $E[S^3]$ like $E[S] = E[X]*E[N]$ ?
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