We analyze an impact of the dependence degree between the error components on parameters estimation in stochastic frontier model. It is also demonstrated that for derivation of estimates of technical efficiency one is advised to consider different copulas to model joint distribution of the error components.
The probabilistic characteristics of the graph of degrees of equiprobable random mappings. In particular the exact expression of the probability of collision for two random vertices in the graph of degree of random mapping is obtained.
On the question of the applicability of the statistics of the measure "chi-square" in the problem of determining the parameters of block encryption algorithms