number of failures until experiment is stopped
success probability
standard deviation
var v = stdev( 100, 0.2 );
// returns ~44.721
var v = stdev( 20, 0.5 );
// returns ~6.325
var v = stdev( 10.3, 0.8 );
// returns ~1.794
var v = stdev( -2, 0.5 );
// returns NaN
var v = stdev( 20, 1.1 );
// returns NaN
var v = stdev( 20, NaN );
// returns NaN
var v = stdev( NaN, 0.5 );
// returns NaN
Returns the standard deviation of a negative binomial distribution.
Notes
r
which is not a positive number, the function returnsNaN
.p < 0
orp > 1
, the function returnsNaN
.