Returns the variance of a Poisson distribution.
λ
NaN
mean parameter
variance
var v = variance( 9.0 ); // returns 9.0
var v = variance( 1.0 ); // returns 1.0
var v = variance( -0.2 ); // returns NaN
var v = variance( NaN ); // returns NaN
Returns the variance of a Poisson distribution.
Notes
λ
, the function returnsNaN
.