Yes. You are right. This is quiet evident from the additive property of Gamma distribution. Regards Madan Gopal Kundu Xin <[log in to unmask]> wrote: Dear All: If y~Ga(a,b) What's about the (n-1)y~Ga(a, (n-1)b), is this right? Many Thanks -------------- Madan Gopal Kundu Biostatistician and SAS Programmer Ranbaxy R&D Gurgaon, Haryana India Web: http://www.freewebs.com/madanstata mobile: 91-9868788406 e-mail: [log in to unmask] Click to join Statisticians_group --------------------------------- Here’s a new way to find what you're looking for - Yahoo! Answers