NONPARAMETRIC ESTIMATION 80% OF THE RESOURCE BY REPEATEDLY CENSORED SAMPLE
The article deals with the case of termination of tests (observations) for various reasons, the result of which is a right-censored sample. The proposed three criteria of distinctness censored samples. The first two criteria are based on the distribution functions of individual developments to failure and to censorship, and on a uniform distribution, and characterize the sampling structure, that is, the location on the numerical axis of failures andcensors. The third criterion, the coefficient of censorship, is equal to the share of non-failed products. Taking into account that by the present time a lot of estimations of distribution functions on censored samples are known, the authors solved the problem of finding the areas of their application for the estimation of 80% resource using simulation. Areas of application were established depending on the values of the criteria of distinctiveness. The technique was tested on the results of the performance tests, capital re-fied tractors DT-75, YAMZ-240Б. The relative error of estimation of 80% resource according to the proposed method does not exceed 7% and indicates the possibility of estimating the durability index for a shorter period of time, not reaching all the products to the limit state. For the considered objects the duration of operational tests could be reduced by more than a year.