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The provided research is directed to identification of the predictors affecting at sizes of basis risk multiplier of a loan default for a certain period. Survival models (Cox proportional hazard models) taking into account a grouping sign of rating of reliability of borrowers are put in the basis of calculations. In the conducted research data on loans in the Californian company Lending Club which is engaged in equal crediting were used. The borrower for whom the risk of approach of a default by a certain period was predicted acted as an object of the research.