The reliability of a system is the probability that when operating under stated environmental conditions, the system will perform its intended function adequately. We consider the strength of the system X and the stress Y as random variables. The component fails at the instant that the stress applied to it exceeds the strength and the component will function satisfactorily whenever X>Y. The quasi-likelihood function was introduced by Wedderburn (1974) to be used for estimating the unknown parameters in generalized linear models.
Dr. Dhanya M. and S, J. E., “Quasi Bayesian Estimation of Stress Strength Model for the Power Function Distribution”, International Journal of Current Research, vol. 7, no. 11, pp. 22921-22927, 2015.