RECOMMENDATION 
ITU-R  P.1057-2
Probability distributions relevant to radiowave  propagation modelling
Scope
Annex  1  Probability distributions relevant to radiowave propagation
modelling
 1     Introduction
 2     Probability distributions
 3     Gaussian or normal distribution
 4     Log-normal distribution
 5     Rayleigh distribution
 6     Combined log-normal and Rayleigh distribution
 7     Nakagami-Rice distribution (Nakagami n-distribution)
(See Note 1)
 8     Gamma distribution and exponential distribution
 9     Nakagami m-distribution (see
Note 1)
10     Pearson χ2 distribution
Annex 2
Step-by-step procedure to approximate a complementary cumulative distribution
by a log-normal complementary cumulative distribution
 1     Background
 2     Procedure