Mean and Variance of the Negative Binomial Distribution

Formula: \(\mu = r \cdot \frac{1 - p}{p}\) \(\mathrm{Var}(X) = r \cdot \frac{1 - p}{p^2}\)

mnbinom(size, prob)

Arguments

size

Number of successes

prob

Probability of success

Value

List with mean and variance

References

Casella, G. and Berger, R.L. (2002). Statistical Inference. Duxbury.

See also

dnbinom

Examples

mnbinom(size = 5, prob = 0.4)
#> $mean
#> [1] 7.5
#> 
#> $variance
#> [1] 18.7
#>