Statistical methods including Quadrat analysis, Cluster analysis, Descriptive statistics and Geographic Information Systems are used to study spatial distribution and to summarize data about earthquakes in Bulgaria and neighboring areas. Detection of areas with similar pattern of earthquakes occurrence is of interest for the Government and for general public. Seismic risk for NPP "Belene" is discussed.
Simulation models describe the functioning of agro-ecosystems and the flow of processes in them using computer programs. With their help can be made computer experiments and to predict the behavior of agro-ecosystems. One of the main problems in the creation of simulation models is imitation of uncontrollable soil and weather factors. A
number of studies of soil properties and meteorological characteristics indicate that these stochastic variables do not follow the normal (Gaussian) distribution. In the selection of statistical models that approximate the distribution of such stochastic variables, the most appropriate is a family of Johnson distributions. The article examines ways to generate
pseudorandom numbers from Johnson and Burr distributions families for simulating soil and weather factors determining agro-ecosystems.
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