“…Assume x U(1) , x U(2) ,…, x U(n) is the first upper record values observed form Lomax(λ, α), and y U(1) , y U(2) ,…, y U(m) is the first upper record values observed form Lomax(λ, β). Based on these samples, we can estimate R. Recently works on interval estimation of R were discussed in Rezaeia, Tahmasbib, and Mahmoodi (2010), Baklizi (2008a;2008b), and Shoukri, Chaudhary, and AlHalees (2005). First, consider the MLE of R and its distributional properties.…”