probability factor phi(x) = ϕ(x) and probability density phi'(x) = ϕ'(x) 

cumulative probability factor phi cum (x) = ϕc(x) normal distribution deisenroth

 x µ σ standard normal factor simulation
(σ = standardfaktor sigma = σ(µari/µgeo) = standardnormalfaktor sigma deisenroth = σd )