shahram yaghoubzadeh

In this paper، we introduce a new five-parameters distribution with increasing، decreasing، bathtub-shaped failure rate، called as the Beta Weibull-Geometric (BWG) distribution. Using the Sterling Polynomials، the probability density function and several properties of the new distribution such as its reliability and failure rate functions، quantiles and moments، Renyi and Shannon entropies، moments of order statistics، mean residual life، reversed mean residual life are obtained. The maximum likelihood estimation procedure is presented in this paper. Also، we compare the results of fitting this distribution to some of their sub-models، using to a real data set. It is also shown that the BWG distribution fits better to this data set.