Returns the standard deviation of a chi distribution.
k < 0
NaN
degrees of freedom
standard deviation
var v = stdev( 9.0 ); // returns ~0.697
var v = stdev( 1.0 ); // returns ~0.603
var v = stdev( -0.2 ); // returns NaN
var v = stdev( NaN ); // returns NaN
Returns the standard deviation of a chi distribution.
Notes
k < 0
, the function returnsNaN
.