Tests are presented for comparing trends in the rate of occurence of events for two Poisson series. The tests are based on a product model which is similar to the one proposed by Cox [2]. The model allows arbitrary trends in the individual series. Although the density function of the observable...

The exponential model of Jelinski and Moranda (1972) is one of the earliest models proposed for predicting software reliability. A test of fit procedure, based on the conditional probability integral transformation of O'Reilly and Quesenberry (1973), is proposed in which a set of ordered failure...

Random variables X1 ,..., Xn are said to have a joint distribution with Weibull minimums after arbitrary scaling if mini(aiXi) has a one dimensional Weibull distribution for arbitrary constants ai 0, I = 1,..., n. Some properties of this class are demonstrated, and some examples are given which...