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This study was concerned with some aspects of single server queues where customers arrive singly to receive some kind of service from a server. We discussed in detail the queueing models for different specifications of arrival and service pattern. The emphasis was given on distribution of queue size, waiting time, sojourn time and busy period.A particular queueing model has also been considered in chapter four. In production process, sometimes it is costly to keep the machine on when there are no jobs to be processed. It has been suggested that it could be reasonable to set up a threshold...

In public health and demography, large-scale surveys often follow a hierarchical structure of data as the surveys are based on multistage stratified cluster sampling. The appropriate approach to analyze such survey data is therefore based on nested sources of variability which come from different levels of hierarchy. Using the 2004 Bangladesh Demographic and Health Survey contraceptive binary multistage stratified clustered data, this study is designed to assist in all aspects of working with multilevel logistic regression model. It is found that failing to take into account the multilevel...