probability method
The Probability Density/Mass Function (PDF/PMF).
Returns the probability of the distribution at x
.
Implementation
@override
double probability(double x) => x <= 0
? 0
: exp(-log(x) -
0.5 * log(2 * pi) -
log(sigma) -
pow(log(x) - mu, 2) / (2 * sigma * sigma));