In this paper, we solve a type of shortest queue problem, which is related to multibeam satellite systems. We assume that the packet interarrival times are independently distributed according to an arbitrary distribution function, that the service times are Markovian with possibly di erent service rates, that each of the servers has its own bu er for packet waiting, and that jockeying among bu ...

We propose nite sample tests and on den e sets for models with unobserved and generated regressors as well as various models estimated by instrumental variables methods. The validity of the pro edures is una e ted by the presen e of identi ation problems or \weak instruments", so no dete tion of su h problems is required. We study two distin t approa hes for various models onsidered by Pagan (1...

s for key publications representing project findings during this reporting period, are provided here. These are listed alphabetically by first author. A complete list of publications that appeared in print during this reporting period is given in section 3 below, including publications representing findings that were reported in the previous annual report. [1] A Stochastic Approximation for Hyb...