phi limit sigma factor distribution deisenroth
= σ(x/µ;ϕ;σd;n)
= σd^±√(-ln(ϕ)/n)
= x(ϕ;σd;n)/µ
= x/µ
= σ
= σ(ϕ)
= σ(x/µ)
= sigma factor deisenroth