shape parameter
scale parameter
variance
var v = variance( 4.0, 12.0 );
// returns 32.0
var v = variance( 8.0, 2.0 );
// returns ~0.109
var v = variance( 1.0, 1.0 );
// returns Infinity
var v = variance( 1.0, -0.1 );
// returns NaN
var v = variance( -0.1, 1.0 );
// returns NaN
var v = variance( 2.0, NaN );
// returns NaN
var v = variance( NaN, 2.0 );
// returns NaN
Returns the variance of a Pareto (Type I) distribution.
Notes
0 < alpha <= 2
andbeta > 0
, the function returns positive infinity.alpha <= 0
orbeta <= 0
, the function returnsNaN
.